Here's a pic of what I described earlier.
Insulator - Carb - Gasket My assumption is the little hole in the base of carb need access to vacuum.
But that hole does NOT line up with the notch in the insulator, nor the hole in the gasket. (Incidentally, the hole in the gasket does line up with insulator notch)
So, I made a notch in the gasket that lines up with the hole in base of carb. Will that work?