IMO The original rear end should stand up to just about any engine you put in the car. Build it right, build it tight. I have run 450HP with stock 10 bolt BOP rears without a problem. Pick up an Eaton or Auburn posi unit to make it posi and you are good to go. Jegs and Summit have all the parts you need. Keep in mind it's a tricky job and you should have an experienced hand looking over your shoulder when assembling.
