GT500's aren't exactly common. Examples kept at the company are even more rare, and designated "engineering" cars are rarer still. This 1967 Ford Shelby Mustang GT500 is among the latter. One of only 11 built that year, chassis number 0425 was born at Shelby's California plant, and still features the original 7.0L V8 with twin Holley four-barrel carburetors, four-speed manual gearbox, inboard headlights, push-button Ford radio, and door locks. It's got only 52,000 miles on the odometer, has undergone plenty of maintenance to ensure it remains roadworthy — like swapping out the included original wheels with after-market replacements — and has only one notable defect, a non-functioning fuel gauge. So just remember to fill up before you head out.