There have been several Mach 1 Mustangs over the years, but the 1971 Mach 1 is the one to get. This car came out only on the SportsRoof fastback body style. It had some exclusive visual elements like a hood treatment with hood pins, chrome pop open gas cap, special wheels, and a rear deck spoiler.
The 1971 Mach 1 got the 302 V8 engine as standard, but you could also get it with your choice of two different versions of the 351 V8 or the 429 V8. In order to fit the big engine in the car, Ford had to make the Mach 1 physically longer, giving it somewhat awkward proportions. However, the payoff was an engine rated at 375 hp, and like many engines of this era, it was likely underrated.