I am looking for an inexpensive way to boost my little honda's power with out spending to much money. And I figured that swapping on a better head is just what I need, I wanted to use a DOHC head (D16A9/Z5) because I was told you can tune those a little bit more power from those then a SOHC head. But I am not sure if the head will bolt on to my D15B2 block without modification, like if I have to tap the block so that head can bolt on properly. And I already know that I should get a new ECU, upgrade from DPFI to MPFI, which would mean a new intake manifold. I'll be doing thins on my 1990 Civic Wagon.

I been posting this question on all the credable Honda forums, better to get more information from as many places as possible.