D16A6 block w/ D16Z6 head, which ecu to use?

I just bought a '92 civic that the owner swapped a D16A6 (from a '91 civic) block into, and he said it has a head from a D16Z6 on it. I looked it up and I think the head is supposed to be vtec.
The car came with a P05 ecu and it has been acting a little strange since I bought it, kind of sputters a little bit sometimes. Previous owner said it might be running rich and might need a P06 ecu.
What ecu do you think I should try putting in the car?
I read somewhere that cars that came with D16A6's had PM6 ecu's, and cars that came with D16Z6's had P28 ecu's so I don't know what to try.
Thanks for the help!
The car came with a P05 ecu and it has been acting a little strange since I bought it, kind of sputters a little bit sometimes. Previous owner said it might be running rich and might need a P06 ecu.
What ecu do you think I should try putting in the car?
I read somewhere that cars that came with D16A6's had PM6 ecu's, and cars that came with D16Z6's had P28 ecu's so I don't know what to try.
Thanks for the help!