Slant won't start!!?!!?!?

So I need help... once again. My 225 won't start after possibly overheating it last week. I was driving home (uphill) and my temp started climing and the gauge went to about 3/4 of the way. Then it went to 0 as I pulled to the side of the road, turns out the temp sender wire came off. Along with that, the damn radiator fill neck blew off! Yup, blew off! All the coolant/water gushed all over. After letting it cool, I tried starting it and nothing. I replaced a few things before this (starter, ballast resistor, points to electronic, wires, cap, rotor, coil, battery). So now the engine will turn but won't fire up. I don't know if this is right but I used my timing light on each plug wire to see if it was firing and the light lit up on all wires. I can also see gas squirting in the carb if I pull the throttle. Does it sound like it's just a timing issue or could I have blown the head gasket and lost compression? The oil looks fine, but loosing the radiator neck got rid of all the water. I'm just so frustrated and bummed that it's hard to think straight. Thanks for your help in advance!