Early 72 340, is this one of the de-tuned ones?

Hot restarts are problem on my car with ethanol. When cold it starts in less than one revolution. If I drive and then try to restart after sitting 10 minutes it takes about 5 seconds of cranking. There is a window of time and it seems to be about 15-20 minutes after shutting down. Let it sit longer than that and it usually starts up easy like normal. Yeah ethanol sucks for carburetors.
Anyone else notice it tends to grow some sorta mold around the gas caps?
since i added an electric fuel pump never had any starting problems