Crux, when re-assembling the carb "top" be sure that the tube rising out of the bowl ABSOLUTELY seals with the gasket!!
When you take her apart look at the center area of the gasket and you should see a dimple that should be a full circle. If it is not a full circle it will really make things bad as there will not be any ariation of the fuel being delivered to the venturi which can cause "puddling" in the manifold. this raw fuel will then drain down to the carb once the engine stops.
The center piece is the "emulsion well", thew heart and soul of the carb's metering!
Dave Neptune