Image Credit: Top Gear / YouTube.The Fox Body Mustang has always had a certain reputation of being somewhat cheap, light, endlessly tunable, and frequently saddled with a chassis that struggled to keep up with whatever horsepower owners threw at it.Velocity Restorations has decided that was a problem worth solving, and its latest restomod takes the familiar third-generation Mustang shape and rebuilds almost everything underneath while preserving the boxy styling and late-1980s character that made the car memorable.Top Gear's Tom Ford recently spent time with the Florida company's Fox Body, including a visit to Velocity's headquarters and a track drive in a development car. What looks at first glance like a beautifully restored Mustang is hiding considerably more engineering than its subtle exterior suggests.AdvertisementAdvertisementThe headline number is 715 horsepower, but the real story is how thoroughly the rest of the car has been reworked to cope with it. Velocity has effectively turned one of Ford's most famously flexible pony cars into something far more serious.A Second Chassis Fixes The Fox Body's Biggest WeaknessImage Credit: Top Gear / YouTube.The original Fox Body used a lightweight unibody construction that was never especially rigid. Add power, sticky tires, and hard driving, and the chassis could flex enough to undermine the suspension underneath it.Velocity's solution is a Roadster Shop-spec chassis bolted underneath the original unibody, dramatically increasing stiffness while providing a proper foundation for independent front suspension and a multi-link rear setup. If that sounds familiar, it's because we recently covered Roadster Shop's very own Fox Body 'Stang when it was featured by Autotopia LA.Coilovers are fitted all around, while a Ford 9-inch rear axle and carbon-fiber driveshaft handle the power. Six-piston disc brakes are fitted at all four corners, giving the roughly 3,000-pound Mustang far more stopping ability than the original ever had.The Coyote V8 Makes Up To 715 HPImage Credit: Top Gear / YouTube.Under the hood sits a modern 5.0-liter Ford Coyote V8 driving the rear wheels through a 10-speed automatic transmission. In its standard configuration, the engine produces around 500 horsepower.AdvertisementAdvertisementBuyers looking for something more serious can add a Whipple supercharger. That pushes output to 715 horsepower, an enormous figure for a car this light and compact.Fitting the modern drivetrain required significant work. Velocity had to modify the engine bay, fabricate new inner fenders, and massage the transmission tunnel to make room for the physically large 10-speed automatic.Tom Ford found the finished car surprisingly composed on track. It still moves around enough to feel old-school, yet the added rigidity, modern suspension, and contemporary tires give it precision a stock Fox Body never had.The Interior Looks Old Even Though It Isn'tImage Credit: Top Gear / YouTube.Velocity applied the same philosophy inside. Rather than replacing everything with giant displays and modern switchgear, the cabin has been designed to look like an unusually well-built version of the original.AdvertisementAdvertisementHeated Recaro seats use period-inspired fabric, while Alcantara and leather quietly improve the materials. Dakota Digital gauges mimic the original cluster, and a billet steering wheel retains the basic shape and even the factory-style cruise-control buttons.Modern conveniences are hidden in plain sight. There is proper air conditioning from Vintage Air, electric windows, phone charging, cupholders, and a modern Blaupunkt stereo styled to resemble an old cassette deck.It still looks like a Fox Body Mustang, but it delivers the power, brakes, chassis control, and comfort the original never had.At roughly $280,000 to $300,000, none of this comes cheaply. Still, Velocity's Fox Body shows just how far a restomod can go without erasing the quirks and nostalgia that made the original appealing in the first place.If you want more stories like this, follow Guessing Headlights on Yahoo so you don't miss what's coming next.