The same carb has been on the car for 10 years and attached the same way the vacuum hose is connected the the right side of the carb the same as my other 5 cars. I have not checked the timing with the vacuum advanced attached. I have monkeyed with different settings and it seem to like 12 the best. It is somewhat difficult to determine what is best as the car has a pretty radical cam. I replaced the distributer as the original one looked terrible and was thinking it was causing the issues and it has been a few years since the carb was rebuilt. Replaced the plugs and wires and fuel filter as the car has not be touched in a few years. After all this, the car runs terrible and extremely rich and fowls the plugs just idling for 10 minutes. Cleaned them drove the car up the street coughing and bogging down, but has the power when I got on it. Checked the plugs black carbon again. My 2 mechanic friends both have different opinions on the issue, 1 on the distributer and timing, the other thinks it has 2 too tight valves as the manifold pressure bounces all over the place. The carb guy says it is OK. May be time for the crusher!!!!