Evaporating Fuel in Carter 4-Barrel Carb?

About 1973, the factory put in a thicker carb spacer, plus they reworked the fuel line repositioning the fuel filter to vertical behind the alternator. The filter stays completely full of fuel and cooler. I did both to my 67. Solved all the fuel delivery issues. Even after it has sat covered for a couple months, I turn it for 5 seconds, then 1 pedal to the floor to set the choke. Turn another 3 to 5 seconds and verooom :)