s2k+k20+h22= complicated airflow

Im doing some Frankenstein stuff right now nothing complicated but something im not really knowledgeable in. I have an h22 in my 92 da but i think its lacking power. So i bought an s2000 throttle body and a 2006 civic si intake manifold manifolds inlet is 62mm and the s2k throttle body is 64mm i know a simple bore could match these up but i would lile to bore them both out to about 66mm unfortunately i know there more to the flow of things then just going bigger. So i need someones help with understanding the concepts of the air flow or just general tips. Thanks and sry for the long intro

More aggresive cam would also benefit in conjunction with the bigger throttlebody and boring of the intake manifold…and ofcourse good tune

Well im interested in cams as well but not until i can get my whole intake problem figured out