I have a 1950 3100 with a 216. I have neveer had the engine running, but I am near that point finally. I have a Carter 730S carb that came on the engine when I bought the truck. It has a couple of holes in the base that are opposite to the slots in the carb insulator underneath. What do these holes do and by putting a gasket in between the carb and insulator that will open them up to "breathe"?

Thanks for all the help for this newbie.

Jerry