"I for sure agree that fuel inside the carb bowl is vaporizing or building pressure or something causing fuel starvation."

If non-ethanol fuel is available in your area, as an experiment try a tank full. I'll wager the problem disappears. Now the question... is the slightly extra cost (in my location at least) worth the benefits.

Good Luck,

RonR


RonR


1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1964 CJ5