Thanks again, but I don't think it is vapor lock.
It can happen on a cool day same as a hot, and after running just a short while too. It is something else entirely.
Try this. Next time you drive it and get it hot, shut it off, take off the air cleaner and watch what happens in the carb. See if fuel is dribbling out inside the throat of the carb, getting the throttle plates wet. If so, the fuel is getting hot, expanding and basically siphoning the float bowls dry, flooding the engine at the same time.
I suspect that is the case and you will need to block off your exhaust crossover in the manifold.
