John is right. For some reason or another there is way too much fuel in the bowl. This can be caused by a stuck needle and seat, improper float level, or even too much fuel pressure. Fuel can't get to the boosters without going into the bowl first.
How big is your carb and what is the rest of the combo? I know the guys at BG are not the most helpful but I have been able to get a few good answers from them over the years. I'm sure they think the carb might be wrong for the application (which may be right) and don't want to waste time helping you make it work.
Hope this helped a bit.
Jason