You can install any small block Ford in a Mustang even if it came with a six , the engine bay is designed for the largest engine available for its year . But I would go to a 302 roller and get the RPM's from it for speed . I have a 351 and am looking at torque number with it going into a 37 Ford Coupe , will need more torque to get it rolling .

I am not building race cars though just some good old fashioned Iron .

I may drive up to Pat to assembly a bullitt proof putter for the 37 .