Port and polish the intake manifold.
That will help you out alot!............If I had an H22 I would full build it N/A.

Its amazing seeing those skunk2 cars ( mainly B-series engine) make so much power without Turbo.
My sisters boyfriends brother has a crx with an H22 engine in it.
I didnt believe it until I saw it.
That engine practically takes up the whole engine but it was done.