10. 1974 Pontiac Firebird Trans Am SD 455
By 1974, almost all muscle cars were extinct from the market. Those that remained lacked both power and style. However, one model managed to survive and offer as much of both as possible. That model was the 1974 Trans Am Super Duty 455. The year marked the first restyling of the whole Firebird range with a new front and rear end and improved interior and details. The SD 455 model carried over from 1973 but featured an updated suspension and brakes in a new package.
The standard 455 V8 had only 215 HP and 290 HP in SD trim, fantastic for 1974. In fact, with 290 HP, a host of performance upgrades, and a four-speed manual transmission, the 1974 Trans Am SD 455 was faster than the Corvette. This made it the fastest American production car of the period.