F22 starting problems

My friends 91 accord is having some problems starting. They replaced most of in ignition inculding the distrbutor, spark plug wires, and spark plugs, nothing is helping. The car does turn over and sounds like it wants to start, but is not. Before he put a new headgasket in it was running fine(except the fact that it needed a new head gasket) Anyone have anything to say?

It sounds like either a electrical connector being unhooked or he has the Igntion timing off. I would start by checking that he has the timing correct, then look for a unhooked connector.