ok so, i had a mechanic look over my 5m. he said its trashed complete rebuild is needed. so i have the option of a 302 V8 and C4 trans. has anyone done this? notes to share? will the rearend hold up to the horsepower? this is a mid 70's mustang setup with cam,highrise intake, and carb. interals bore and stroke i am not sure of. if i had to guess it i would say its pushing 300hp easy. i drove the car the engine is out of, fried the tires quick.