Keeping it cool
Check your timing..if it's advanced to much your engine will run a bit hotter than usual and be difficult to start when hot. Add water wetter to the coolant, that will help drop the temp just a bit also. Do you have the correct water to coolant percentage...50/50 mix is suggested. Run a fan shroud to direct the air flow through the radiator and not around it. Don't run one of those light-weight 4 blade fans, they don't pull enough air to cool the radiator, use a stock 5 blade and or one with a fan clutch..please get back to us and tell us if this helps solve your problem.