If you are having to pull the metering rods out of the jets to get rich enough mixture for idle there is a serious issue with the idle circuits. Either a restriction or a baseplate gasket to body mismatch. If the boosters are starting to spill over at fast idle then the float level may be a little high as well but until you find out why fuel is not flowing through the idle circuits properly you can't really diagnose any other issues with the carb.