Is this the rarest Boss? An all-aluminum Can-Am 429ci. Tasca Ford owned the street with this car. Bring on Hemis and SS 396 Camaros. As one of six pre-production 1969 Ford Mustang Boss 429s ...

Additionally, buyers could opt for a 4.30:1 Detroit Locker for further road-gripping ... shoehorning the Boss 429 engine into the Mustang required major modifications. Mustangs came off the ...