So I just rebuilt the Holley 1940 on the 200ci in the wife's 66 mustang. I has been sitting pretty much for the last 3-4yrs cause we haven't had the cash or time to get it running right. Anyway, I am trying to figure out what the hole in outlined in red in this pic is for. When I took the carb off there was noting attached to it and I am kind of thinking this was causing some issues and is probably part of the reason why it wasn't running good. Any help would be much appreciated as I am a bit of a carburetor noob.
