Re: BBC engine advice ?
You don't even need to think about 632, unless you wanna have something to brag about. Have vortecpro (or other engine builder) build a 468 or 496, that's all you need for street. Either one when properly built will put out more power than tires can handle.
I've had cars with 700+ HP before, and now that I'm restoring my Chevelle I decided (realized) that all I really need to have fun on the street is a reliable 500hp 468 and an Auto gear Muncie.