This Firebird Formula SD 455 is one of only 43 built in 1973, and for comparison's sake, note that Pontiac built six times as many Trans Ams with the Super Duty engine. The dash and center console are pure 1970s funky, with a complete array of gauges monitoring everything from oil pressure to voltage. You'll also note that this car is loaded with options, including power windows, power locks, a factory 8-track player and even factory A/C.

This car is powered by the famous Super Duty 455 engine, which featured a reinforced block, special camshaft, aluminum pistons, oversize valves and header-like exhaust manifolds. Pontiac rated the SD-455 engines at a stout 310 horsepower and 390 pounds of torque, but many experts have pegged the output closer to 370 horsepower.

All the other correct Super Duty components are present and accounted for, including the massive hood scoop up top, which was more for show than for actually feeding air to the engine. The block was covered in Pontiac Turquoise paint during the rebuild, and today has a nice original-looking patina to it that fits perfectly with the rest of the car's condition.

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