If you can find out what the actual static compression ratio is and give me the casting numbers on the heads, I can try some different combos on the DynoSim for you. One thing I have definitely found though, is that in order to free up some hp and make the motor more efficient, a good high-rise, dual-plane intake manifold such as a RPM or Stealth and a set of 1 5/8" diameter, long-tube, tuned headers should be in the plan.