Well, I dremeled down the eroded area with a wire wheel brush and it looks better (i guess short of replacing the carb it's going to be the best it'll ever get ). So I started reassembling the carb, but in checking over the JB on the venturis I noticed that it's still slightly tacky. I would've thought it'd cure by now- or is that normal for JB? If worse comes to worse I could soak a venturi overnight in gasoline and see what happens....