[Jerry Cowing]

Silk,

I had the exact same problem. If you were to remove the air cleaner and stand beside the car for a few minutes, pretty soon you would see the gas jetting out of the accelerator ports near the top of your carb. This is because when you shut the car off, the cold gas from your tank expands after it is heated by your intake, etc. The mechanical fuel pump won't let the expanding gas go backwards into the tank, but the gas has to go somewhere so it pushes through the accelerator pump ports and floods your engine.

As Mr Fixit said, use a Phenolic spacer, not a metal spacer. The half inch phenolic spacer solved my problem.

If this doesn't work, you could place a T fitting in your carbs fuel line and a T fitting on your tanks vent tube. Then run a line off this carb T back to your tanks vent tube T. Place a small valve in this line to let the excess pressure bleed back into your tank after you shut the car off. The valve could be an old jet that has a small hole in it stuffed in the line. This small hole won't interfere with the gas going to your carb, but will allow the expanding gas to be bled off.