So both carbs, the old Rochester and the new carter yf, have two holes for vacuum. One in the throat and one on the base. The Rochester had a gasjet that covered the base hole the new carter had a gasket that had an opening for the base hole. I thought maybe that was the problem. I got a gasket that covered that hole on the base and the rpms at idle are still way too high.
Would gladly post pics but I’m not allowed yet.
