So Heres my I have seen everywalk of engine out perform another in some shape form or fashion. 383's are considered the "best" because you can build them from the beer can collection out back. Cam it up some a 292 does good on the street and strip its more less a midground of performance and affordability to cruise and not have to carry a can of fuel with you. Drop a matched intake and carb to it as well as a stall. This should add a good enough thump/set you back in the seat for a "street Sleeper" its quick simple and reasonably cheap. Guy ran at George Rays wildcat Dragstrip for years as the 8.0 champ 1/8th mile ran small blocks with that smae setup and 3 on the tree and he was the man to beat. The only thing that would be noticable from the outside is the intake which can be painted to match the block and be harder to tell.