4.6 to 5.0
 

How hard would it be to put a 302 into a 94 T-Bird with a 4.6. What would I have to change and would everything bolt up

Ouch! I would guess that you'd need a tranny, motor mounts, computer, the complete engine, and maybe some fabrication work. The 302 is smaller than the 4.6, so you should have the room.