Evaporating Fuel in Carter 4-Barrel Carb?

I have exactly the same issue in my Valiant and Barracuda. Carter 1 bbl and Carter 625 AFB respectively. I understand today's gas formulation makes it evaporate quicker than before. Seems to me 24 hrs is the limit. If I drive either car on consecutive days, it's not really a problem. I don't mind the extra cranking because maybe the oil starts moving and gets where it needs to be before it fires.