fuiw

I just put a d15b7 cylinder head on my d15b8 block. My b8 does have the 16 valve pistons. I got everything put together now the car will crank but it won't turn over. I hear the fuel pump prime when I put the key in the "on" position, I smell gas in the plugs, plugs are gapped properly, plugs have spark. The only thing I changed was the head and all necessary gaskets (I.e. I did not change water pump, cam gear, distributor, cap, rotor). Everything bolted up perfectly, but now the car doesn't start. PLEASE HELP ME!!!