1995 Honda Civic Won't Start

Please help guys, let me first say that I don't really know much about cars, just a little.

A few weeks ago my engine overheated because of a failed radiator. Me and my dad replaced the radiator, and discovered water was leaking into the engine, it occasionally ran a little rough on start, but that wasn't main concern.

Today we were gonna try to solve the problem by tightening the head bolts, we checked out the timing belt and also changed the spark plugs because they seemed a little worn. After we put everything together, now the car will not start at all. It cranks, but does not fire up. It was later determined that we were only occasionally getting sparks... sometimes we will, other times we won't. Either way the car will not start. Very confusing to us since it worked fine just yesterday.

We tried the old spark plugs, checked the fuses, cables. I want to check the main relay, does anyone know where this is located on a 95 honda civic? Tried to take off rotor but it seemed stuck... might be able to pry off. Any ideas?

and discovered water was leaking into the engine,
Hey Guy, You have a broke ass Head Gasket!!!
Main Relay is by the underdash fuse box, by the cluch pedal ECT.

thanks for the reply, yea I know the headgasket is probably warped from the overheating.

I actually fixed the starting problem, turns out it was a bad distrubitor :)

headgaskets don't warp. heads and blocks warp. heat gasket didn't necessarily blow. if u overheated the engine u prolly warped the head. take it to a machine show to have it leveled, and get a new head gasket. don't over tighten the head bolts, u could cause more problems than u had before hand. also when u take the head bolts off and when u put them on, make sure u do them in the correct sequence and to the correct torquing sequence also.