[Tucker in KFalls]

I'm hoping to ask the experts, I'm a carburetor novice but trying to learn. I have a 1964 GTO with factory tri-power. I have a small amount of fuel weeping out of the center carb from the throttle body by the throttle shaft on the driver side AFTER the engine is switched off for 5 to 10 minutes. The front and rear carbs do not leak. The center carb will leave a few drips on my intake manifold. It also weeps just in front of the throttle shaft and collects by the intake stud and nut. Maybe from the upper gasket?

When the engine is shut off after 5 minutes or so vapor will begin to appear in the center carb and then I am able to see a several slow drips that collect onto the throttle blades. Mainly on the driver side throttle blades.

I've read that this happens as the fuel heats and expands creating pressure in the line from the pump raising the float level above the main discharge nozzle dripping onto the plates which are closed and then exists out beside the throttle shaft.

The car has always been hard to start when it's warm after sitting but otherwise runs great and starts well when cold.

The question is how to fix it? I've installed phelonic spacers but that didn't help. I've seen in other posts possibly a return vapor fuel line or a possibly a float adjustment. Thanks for your feedback!