Since the car was running before the suspected overheating situation put it into Bubba's Furrin' Car & Tractor Repair and Shoe Shine Shop, the prime suspect should be whatever they could have messed up while doing the head gasket.
0. Charge the battery. Or get a fresh one and charge it. 12.5v is almost dead. Change oil.
1. Start with establishing that engine timing is correct. I would suggest setting up the car like I describe in my valve adjusting How-To so you can use the right rear wheel to turn over the engine. Remove the #4 spark plug, put a wood dowel into the spark plug hole so you can visualize what the piston is doing, watch the cam lobes, and turn over the engine by hand. Check the flywheel dot against the hash marks on the bell housing window, and the timing marks on the crank pulley and the tin pointer.
2. Once engine timing is positively confirmed as correct, check valve adjustment.
3. Once valve adjustment is checked and corrected as necessary, pull the distributor cap, yank the wires off the distributor cap, establish with a continuity test which internal contacts lead to which spark plug lead terminals on the outside of the cap, mark the plug wire nipples, reinstall the distributor cap. If necessary partially remove the entire distributor and orient it correctly (a Bosch side-firing cap should have the plug lead nipples pointing more or less at cyl #4), then reinstall the plug wires confirming proper firing order.
4. Once the above has been accomplished in a methodical manner, you have a foundation from which no-start troubleshooting can commence.
