I'm not a fan of the BG carbs so i do not know whether or not you have screw in air bleeds. if you don't its a no brainer you will have to restrict the circut in the meetering block or start drilling the air bleed.
Before you do any of this you really need to check the rest of the carb:
Float levels first!! these cause more problems when adjusted high.
ook in the carb while the car is running to make sure there is no fuel dripping out of the boosters.
Make sure the throttle plates front and back are in the middle of the transfer slot so you are on the idle circut.
If all is good a quick way to see if this is the *fix* for you is to get a piece of 12 guage stranded wire and destrand it. the strand should end up around .015take a couple of the strands about 1/2" long, bend them in a 90* about a third of the way down and put one in each of the idle fuel transfer holes in the main body. (the little part in the idle fuel hole and the bent leg between the carb main body)so the leg sits between the gasket. This will restrict the fuel to see if this is your problem.
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