340 Build help please.

The way I see each long block has a general amount of hp sitting and waiting to be unlocked with basic cam 4bbl and headers, Eg. a low cr long block is somewhat limited by what cam you can use especially if it's a mainly street car, take a low cr 318 250-300 hp with most cams people would use, low cr 340/360 325-375hp with the average cams etc... that's why people love LS and Hemi's a lot of untap power waiting for basic hot rodding.