The Boss 429 and 429 Super Cobra Jet V8 engines rank as some of the most powerful engines ever put in the Ford Mustang. In fact, if we limit our discussion to first-gen Mustangs, these engines ...

Ford offered not one ... was available with the same standard engine, and the optional units included five units. The top choice was the 429 4V V8 with a SelectShift Cruise-O-Matic transmission.