Depends on the header. Hooker lists the same # for both 289/302 applications and 351W in a Mustang. Looking at them with a 302 in the car and looking at the tranny crossmember - I don't see how. For the Fairlane youll probably want to find some that are application specific. Or just trim the towers some.
1967 Falcon 4 door 351C - 70 Mustang 351C
Owner built, owner abused.