I can thank you for posting this issue and sticking with it. got me to look at my setup again. My engine runs cool while cruising down the road but the idling around town is what is getting me. so looked at my timing again. i don't have a lot of options with my dizzy so sure a new one will be in the works but i settled on 24 initial and 36 all in not vacuum advance. while the vacuum advance works i only get a 12 degree sweep with or without it so, it does me no good. What i did gain was a cooler running engine in town. ran it for about 45 mins and never went over 190 much better.