suped up 6

With a slant engine the BIGGEST gains are to be gotten in the head. We routinely mill.100 off of the deck or head and put 1.70/1.44 OS valves in. Choices are limited for bolt on parts. As RUNS says a super six may get you where you want to be. A 2 bbl will be ALL the slant needs until you stick some major coin or work into the engine internals. As for over bore you can safely go to .105 or even more(check for core shift).
Frank