I say spend more time reading at "All Motor" section. Kojima is making mad HP on NA DE.
Clark went to work on the ECU and did some tuning for the C6M cams. The result is 200.4 whp @ 7800 rpm. I think this is perhaps the most powerful NA DE around that is well documented. Not bad for a low buck motor.
yeah a search is cool i like the search on goggle it was informative. i guess a few more are
synthetic oil,bored throttle bodie,top engine cleaner,light weight wheels,bigger injectorsnology hotwires,lighter rotors as in drilled and slotted,110 octane are a few things.anymore post em think in the back of your head something that might get u 1/10 horsepower