I suggest also talking to Steve Colletti in dayton. Link

He's built pro honda motors for about 20 years. Also he can do any hondata and dyno work you need in his shop. A big plus is that he can help you with intake/filter and exhaust stuff which is as important for horsepower as the actual motor work. He does my tuning and I found 7 ho in the air filter/big tube combination he suggested. He's good.