The Ford F-series is the best-selling vehicle in America year after year for a reason. Ford didn’t just start building great trucks in the last few years. The F-series is a dynasty that has routinely produced some of the greatest trucks of all time for nearly 80 years. In fact, many would argue that out of all of them, the classic F100 is still the best-looking rig ever to grace this earth. However, being produced half a century ago means it's long overdue for some updated hardware. That’s what Fat Fender Garage, or FFG, set out to do with this 1968 F100, only, they didn’t use the engine you were expecting. Under the hood is a seriously wicked V8 that'll decimate the competition. F100 Sleeper Fat Fender Garage, YouTubeThe story behind this F100 is exactly what you'd expect. As laid out in Fat Fender Garage’s latest YouTube upload, the customer found it in a field. The perfect patina captured their imagination, and they set out to bring the derelict Ford back to life.As the video rolls out, we’re told that the idea was to keep the truck as original as possible. The patina was preserved, and the paint was given a quick polish. They even did their best to replicate the clapped-out look with the new bed floor they had to build from scratch on account of the lowered chassis.The goal, as explained by the FFG crew, was to keep this truck looking unassuming and boring, which they did.. Well, at least, when it comes to everything but the slammed stance. That, paired with the fat tires, is your clue that something seriously wild is lurking below the crusty sheet metal. A GT500 Hidden Beneath Fat Fender Garage, YouTubeThe 1968 F100 originally came with some killer engine options. Among the list of possible powerplants were the 302, 360, and 390 V8s, all of which are strong-running, dependable engines. This particular one is far more potent. Rather than sticking with the classics, the crew at FFG stuffed a GT500 engine under the hood.While we’re not told the specific year of the motor or the original specs, we are told that it’s been worked over quite a bit. Current power output sits somewhere in the neighborhood of 800 horsepower. That’s a massive step up from the 280-horsepower 390—the most powerful engine option for the model year.Fat Fender Garage, YouTubeOf course, an engine is only as good as its gearbox, which has also been updated for this wild ‘68 F100. A six-speed manual helps to put the power to the ground. The first four gears offer a substantial improvement for accelerating, while the double overdrive factor helps this old-school rig sail down the highway as comfortably as any modern Mustang.The suspension has been heavily updated as well. Despite the original sheetmetal, this rig isn’t rolling with factory F-100 equipment. Beneath it all sits an FFG Level 2 chassis, complete with front and rear sway bars to help it handle far better than a typical ‘60s truck. It’s even got a hand brake in case drifting is on the agenda. A Proper Cockpit Fat Fender Garage, YouTubeWhat really ties this build together is that the FFG crew went above and beyond to make this truck enjoyable to drive. As great as a solid chassis and powertrain combo are, a raw driving experience is only fun for so long in regular traffic. Therefore, the team behind it really put their heads together to whip up something that softens the edges of what is otherwise a straight-up race truck.The cabin has been outfitted with custom bucket seats that’ll keep the driver and passenger from sliding around, which isn’t the case for an original bench. They’ve also built a beautiful matching center console that ties into the dash. Yes, they’ve even included cupholders. The truck is also set up with air conditioning, a proper sound system, and a push-button start.While you can still hear the engine when they get after it, the interior is a soft, cushy, rattle-free space at cruising speeds. Everything is tight and clean, which is truly what elevates this truck beyond most in its league, and we tip our hats to the folks at FFG for pulling it all together. What’s especially nice is that they offer a lot of the parts you see here on their website, meaning those who’ve been inspired by this build can replicate it in their own shop.