318 with Carter 2-bbl fuel leak through throttle shaft after hot engine shut-down

So here's the thing. I don't have a problem when the engine is running, under any condition, like idling or stop-and-go for 1/2 hour inching in line at the border under a hot july sun. My fixed 4-blade fan and stock rad seems to keep my 318 cool enough even under those conditions, keeps the fuel line and filter cool enough with the fan breeze I guess. Now maybe the fuel return line coming from the filter going to the tank keeps a steady stream of cold fuel in the filter that helps the big engines cope with vapor lock, and prevents hot pressurized fuel getting into the carb and leaking out throttle shaft or what-have-you when hot engine is shut off.

I wouldn't mind so much if a thimble worth of fuel leaks out the throttle shaft when a hot engine is turned off, but it seems to me that after a few days or a week of sitting there isin't any gas in the carb at all, and it takes a bit of cranking to get it going.