Rather when you lower the bowl with a thick gasket, the height if the gas level is lowered in the carburetor stem (main well interior), further distance from the nozzle tip. I suspect it might make starting harder as the air flow through the venturi must be larger to draw the gas up to the tip of the nozzle, much like lowering the float height. You can ofcourse compensate that thicker gasket by raise the float height the same amount.
I wish all of you a Happy New Year!
Or may I say a better one than the last one that was with lock down and all that..