That actually is a tough one to answer. Gas as we know it today comes in so many forms (winter/summer blend in many states, pure gas w/o any ethanol, 10% ethanol laden gas, E85 which I doubt you run, etc.). Trying to measure actual real time underhood temps under varying day/night conditions is a bear as well.
No harm in isolating fuel lines from heat, using wraps on the lines, changing gas stations (less ethanol is better) using a metal or wood heat shield under the carb. One great way to tell if heat is the real issue is to wait for a cool evening and drive it a bunch qt highway speeds, give it a 20-30 minute heat soak (engine off while hot) and see how easy/hard it is to re-start and how it handles a hot take-off and high speed run for a few miles.
Note as well that an old and weak fuel pump can cause near-identical run issues as hot gas!