Autoblog and Yahoo may earn commission from links in this article.This 1966 Shelby GT350 is a genuine first-generation Shelby Mustang with 41 years of single ownership and a place in the SAAC registry, presented as an honest driver rather than a concours trailer queen. Its 289 HiPo was rebuilt in 1989 around a stronger Boss 302 block while keeping the original heads and valvetrain, and the car was refreshed in 2025 after decades in storage. For a buyer who wants to actually drive a real GT350, this is an interesting and relatively accessible way in.1966 Shelby Mustang gt350Bring a trailerWhat it's worth right nowClassic.com tracks the 1965-1966 GT350, where the very best cars have reached $1,100,000 but the realistic range for driver-to-excellent examples is far lower. Hagerty pegs a #2 (Excellent) 1966 GT350 fastback at around $285,000, while real-world sales have ranged from a $68,320 low up to $217,000 for a restored car with classic Shelby colors and special features, depending heavily on originality and condition.AdvertisementAdvertisementThis car sits at the accessible end of that spectrum for specific reasons: it is a driver, not a restoration, its engine was rebuilt around a non-original Boss 302 block, and it was repainted and partially reupholstered in 2025 rather than comprehensively restored. Those factors keep it well below matching-numbers, concours-correct money, but its genuine GT350 status, SAAC documentation, and long single ownership underpin real value.1966 Shelby Mustang gt350Bring a trailerWeighing all of that, I would call fair value roughly $95,000 to $140,000. The current $75,000 bid with six days remaining is climbing quickly, and where it lands will depend on how bidders weigh the driver-grade condition and non-original block against the car's authenticity and provenance.Condition and detailsThe provenance is the foundation. This is chassis SFM6S1710, a genuine 1966 GT350 that the seller has owned for 41 years, acquired out of California in 1985, with SAAC documentation and records detailed in the gallery. It retains the GT350 hallmarks: Kelsey-Hayes front disc brakes, larger rear drums, relocated upper A-arms, a Monte Carlo bar, bucket seats with latch-and-link belts, and the center-mounted Cobra tachometer. A commenter noted he once owned the car built just before this one, SFM6S1709, which speaks to the community familiarity with these cars.1966 Shelby mustang gt350Bring a trailerThe mechanical story requires understanding. The seller reports that in 1989 the engine was rebuilt using a Boss 302ci four-bolt-main block while reusing the HiPo 289's camshaft, solid lifters, heads, and intake setup. That is an unusual build that knowledgeable commenters found interesting, with one asking whether the coolant passages were correctly addressed between the Boss block and the earlier heads, which is exactly the kind of technical detail a buyer should verify. The original block's availability was also questioned in the comments. A Summit Racing header-back exhaust was fitted in 2025, and one commenter thought the solid lifters sounded like they could use adjustment.1966 Shelby Mustang gt350Bring a trailerThe condition reflects a recently recommissioned long-term-storage car. It was stored in Nevada from 1989 until 2025, then repainted in its original red with white stripes and partially reupholstered, with a new windshield, weather seals, grille moldings, tach, door panels, interior chrome, and steering wheel. New tires went on the chrome Magnum 500-style wheels in 2025. The key paperwork caveat is registration: the car has not been actively registered in California since the 1980s, the seller was told the plates no longer appear in the DMV system, and California bidders in particular should review registration requirements before committing. A pre-purchase inspection and SAAC verification are strongly advised.The offerSpecificationDetailMakeShelby (Ford)ModelMustang GT350Year1966Mileage73,000 shown (approximately 30,000 added by the seller)Engine302ci V8 with HiPo heads, cam, and intakePowerNot stated by sellerTransmissionFour-speed manualDrive typeRear-wheel driveExterior colorRed with white stripes (repainted 2025)Interior colorBlackCurrent bidUSD $75,000Interested in this car? View the listing here.What makes the 1966 GT350 uniqueThe 1965-1966 GT350 was the first Shelby Mustang and remains the purest and raciest of the breed, born from Carroll Shelby's mandate to turn Ford's new pony car into a road racer that could beat Corvettes in SCCA competition. Powered by the K-Code 289 HiPo V8 tuned to 306 horsepower, with a four-speed manual, upgraded brakes, and revised suspension, it was a genuine homologation special sold to the public. These first-year Shelbys sit at the top of the Mustang hierarchy and are among the most collectible American cars of the 1960s.1966 Shelby Mustang gt350Bring a trailerAdvertisementAdvertisementValues reward originality, documentation, and matching-numbers drivetrains above all, which is why there is such an enormous spread in the market between concours cars and honest drivers. A genuine, SAAC-documented GT350 that has been modified with a stronger engine block and refreshed rather than restored occupies a specific niche: it offers the real Shelby experience and authenticity at a meaningful discount to a numbers-matching example, appealing to the buyer who intends to drive and enjoy the car rather than preserve it as an investment piece.My takeThis is a genuine GT350 with wonderful long-term provenance and honest driver-grade presentation, and it is refreshing to see one described as a car you can actually use. My fair-value call is $95,000 to $140,000, reflecting its authenticity and SAAC documentation against the non-original Boss 302 block, the 2025 cosmetic refresh rather than a full restoration, and the registration situation. I would be comfortable in that range for a car that verifies as represented.The buying advice centers on verification and paperwork. Confirm the SFM6S1710 identity through SAAC, understand the Boss-block-and-HiPo-heads engine build including the coolant-passage question a commenter raised, and establish whether the original block is available. Most importantly, sort out the registration path given the car has not been registered in California since the 1980s and the plates are said to be off the system, especially if you are a California buyer. Get a pre-purchase inspection. Handle those, and the current $75,000 bid is an honest starting point on a real Shelby you can drive.Disclaimer: This post is for informational purposes only. We are not a dealership or broker. All vehicle specifications, pricing, and availability are subject to change without notice. We are not responsible for typographical errors, omissions, or the accuracy of the provided information. Please verify all details directly with the seller.AdvertisementAdvertisementAutoblog aims to feature only the best products and services. If you buy something via one of our links, we may earn a commission.This story was originally published by Autoblog on Aug 12, 2026, where it first appeared in the Car Buying section. Add Autoblog as a Preferred Source by clicking here.
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