Ford Mustang 390 GT
Mustang got its first redesign in 1967. There, Ford introduced a slightly bigger and more luxurious model. The design was even better and more elegant. The options list was also longer than ever. Performance lovers finally got a big block option in the form of the 390 FE V8 engine producing 325 hp (via Car and Driver).
It was a fast car, but it was more of a Grand Tourer than a muscle car. The reason was that the engine borrowed from the Thunderbird was more suited for effortless cruising than drag racing.