ChevyConvert,
When the car doesn't start, Pull the coil wire right away and check for spark. I bet that it's there.
If it is, stop thinking about the ignition system and stay on the fuel system. After the car sits hot, and wont start, pull the float bowl fuel level sight screws and see if any of the bowls are dry. One of your metering plates is probably warped and is leaking into the intake, then flooding the engine.
If you pump the gas once and get a good pump shot, the engine should start if it wasn't already flooded.
Easy problem if you know what to look for. Don't start throwing money at it such as a whole ignition swap out just to find out that it didn't help. Have a real car guy look at it first.
Rob