8 1/4 or 8 3/4 rear end

Main performance mods im planing is a Hughes Whiplash cam, Edlebrock performer intake with a Edlebrock 600 carb, Long tube headers. I would like the piece of mind having a rear end that is not on the border line of not being able to handle the power and blow up on me.

AJ/FormS said

The 7.25 will put up with a 318/ auto trans, for a good long time, in a small-tub car; but it will not put up with peg-legging for long.
So if your 7.25 has the right ratio in it, I would just put a Sure-Grip in it.
But if you have to buy gears too, then not.

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