The most important thing you can do is to optimize the compression ratio for your fuel, and pick the right cam for it. I have no idea how high you can go out there, but would assume it will be somewhat more than 10.5/1. The actual power difference between a 10/1 motor and a 11/1 motor is a fair amount higher than you think because it is based on the dynamic compression ratio at low to mid rpms. If you don't have pistons yet, make sure you get this figured out before committing. You may be able to mill the heads a fair amount to help out if you already have the pistons. My 440-1 heads are cut down from 75 all the way to 62cc to get race compression with very little dome. You want to keep the piston to head clearance to a minimum, but not tighter than .040, no more than .045. This will also allow a bit more compression on the same fuel. When figuring all this out, small things like the bore of the head gasket being too big can hurt you a touch. Go the extra distance, build it right and reap the benefits for the whole life of the engine.