throttle body ?

ok, i know all d- series and b series throttle bodies can bolt up to eachother... d->b...b->d... what about the h series? would a h22 throttle body fit om my d16z6.... on a b18c1?

and also, whats the biggest stock throttle body on? b16.. b18... d? any answers will be greatly appreciated.

i wouldnt waste my time on a throtle body right now if i were u. it ill only improve response and mayb 1-2 hp