You're describing the classic "hot soak" flooding condition. The fix is simple- - - -hold the throttle wide open, and once the engine fires (yes, it will start if you don't get impatient and start doing a Jose' Greco flamenco dance on the gas pedal) continue to hold full throttle until it clears out and starts to rev up. Then back off just enough to prevent over-revving and throwing a rod, and hold a fast idle speed long enough for things to smooth out. This procedure was common knowledge back before computers and fuel injection dumbed everybody down.
Jerry