Always go as big as you can afford with NA. ERL's machine work is 2nd to none, and they have built 2000hp LS motors (turbo), tons of sand rail race engines, etc. Google the Ohio boys, and look for Mighty mouse. The guys use their sleeved blocks and engines.
Ultimate power will depend on what you put up top regardless of cubes. The extra cubes will definitely give you more Tq, but your ultimate HP will depend on your intake manifold, heads, valvetrain, cam, lifters, pushrods, etc...
Last edited by Stage7; 12-22-2010 at 06:26 PM.