Car hard to start when HOT

As was mentioned......most likely fuel percolation, then flooding. BUT, could also be ignition related. If mine, I would just do a voltage check on the "+" side of the coil while cranking, just to make sure it's getting bypassed boosted voltage.....full 12v. Also, check your point gap. If it's way too small, you can have hard starting problems.

That is....if you're still running points.