I am picking up a 99 dx block (d16y7) and i was wondering if i could use the same head out of my 91 crx si (d16a6) could i mate these two together, also i am planing om keeping the engine obd 0 , so are the plugs on the back of the block going to be different? i believe there are three of them, i will be using si manifolds. thanks Benny