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stroke it. 393 or 408 with a set of AFR 185 heads. youll need a larger carb 750cfm. then call comp cam and tell them what your building and what its going to be used for and they will set ya up. rough idle doesnt make power either
That all depends on the cam. It could be anywhere from 250hp to ~500hp or more. It all depends on what compression ratio you end up with, and how much fuel you pour down it's throat.