[k0rupt3d]

Iv allways wondered whats the biggest motor you can put in to a 64 mustang with out having to add suports and beef up the front end ?

[rodbender]

351 blocks will fit. Either Cleveland or Windsor. Now with the strokers you can put a 427 in it! Can you say wheeeeee-haaaaa!

[RagHead]

351 Windsor. You can adapt a big block to fit but major mods would be required.

[kens67mustang]

with the 351W, the headers will make it a tight swap