No restart after a hot soak, and then starting after a complete cool down looks like an electronic component heat related failure. Try cooling down the black box power tranistor on the coil bracket and the dizzy body with some kind of spray, like an r134 refill kit with the trigger, one component per start attempt.

Test for spark after a no start, and smell the tail pipe for a fuel smell. Does the tach respond while cranking?

Not responsible for advice not taken...