Thanks Chuck,
The issue was Vapor lock to the point the car would die after a few miles in 80 degree weather. This car has AC. In the Florida heat my under hood temps were high, but operating temps are normal.
To answer the next questions this generates - I replaced the Radiator, thermostat, flushed the system. Engine cooling isn't an issue. I have an all new fuel system and placed a phenolic spacer as well as a Holley heat shield and line shields and still had the issue. I tried 2 different mechanical fuel pumps. I tried both metal and rubber fuel lines from the pump to the carb. Whenever you touched the metal line between the pump and the carb, it was HOT!
The mechanical pump was always hot to touch and was warming the gas. The AC components not only generate more heat, but also restrict under-hood air flow. My car has the stock hood, not the NACA which I think has more clearance plus you can open the vents up if needed (This is a planned change when I paint).
The combination of Ethanol fuels, high road heat, high fuel pump temps, crappy under hood airflow all seemed to contribute, no one item alone seemed to solve it (Ask me how I know). The fuel bowls didn't get overly hot, it was the fuel in the lines vaporizing. Vapor lock is caused by a low boiling point and low pressure lowers the boiling point, so pulling fuel vs pushing makes it worse.
What ultimately solved the issue was a combination of things that keep my fuel cool and I haven't had any issues, even in the last several days of 100+ temps. I removed the mechanical pump to stop the low pressure and parasitic heat. I replaced it with an electric pump right at the fuel tank to push the fuel (and pressurize it). In our cars there are 2 metal fuel lines to the pump. The first ends right inside the firewall and is connected with a short piece of rubber tube to the second metal line that exits the engine bay and runs near the drivers front wheel and in to the mechanical. I cut that second circuit out. I connected to the end of the first metal line near the firewall and ran to the carb from the rear of the engine where there is less restricted airflow.
LOL, you asked!