[BAsque1]

Welcome to the wonderful world of FE nuanses; I have a very similar problem, however, I do not consider it overheating because the highest my car goes is perhaps 220 in idle traffic. Open road stays 180 steady. The problem that this has been causing is vapor lock and gas boil in the carb bowls. I had to adjust the float levels for they were to low and staved for gas. This is still being tested. As the summer goes along I willpost results. I suggest that you add a full bottle of water wetter, it helps a lot to keep the water temp low. The 50-50 mixture of coolant is also wise. You might want to check what kind of thermostat you have, you might have a winter thermostat vs summer.
Hope this helps
Cheers
Lou