snakebittexan,
Sounds like percolation or vapor lock. This happens when the fuel gets too warm and boils, which can happen at 140*F temp or even slightly below. Today's gasoline is cr*p.
The result is that one or both floats sink (frothy gas is not as dense as the liquid) and the carb pukes through its vents into the intake.
If it's severe the engine will flood and die.
The cause of the high fluid temp can be discovered by detective work. A gas line near a header somewhere, heat climbing into the carb from the intake manifold or any of several other places.
Take a look at your gasoline path from the tank to the carb and see if anything looks like it may be causing this.
If it's not the line, then a phenolic spacer and an aluminum heat shield both under the carb may help.
You need to do some looking and report what you find.
I'm fighting this on a hot rod here:
http://www.firstcoastcobraclub.com/v....php?f=8&t=743
Being an extremist
, I've opted to replace the whole system tank to reg, add a return line and relocate the reg too.
I doubt you'll need to go anywhere near
that far!
Tom