I need some advice on which way to go with a tranny choice. I want to use a c4 but i cant decide whether to pick up the stronger post 70 c4 and rebuild it with a shift kit, etc. or go with an aftermarket one like B&M or TCI. What i want to know is, what will hold up behind a 450-650hp small block with forced induction or NOS or both. would a basic rebuild with shift kit hold up to that or one of the aftermarket ones? any bad experiences with this tranny? i know they are supposed to be strong.