Attach the vacuum advance hose to the lower right hand [as you look at it from the front] vacuum port. This is manifold vacuum, the one on the left is stepped. Having the vacuum advance on manifold vacuum will result in more advance at idle, IF your vacuum advance can is working. My car idles cooler with more advance at idle. If your timing is too retarded the fuel air charge may be burning as it's going out the exhaust port which will induce a lot of heat to the water jacket surrounding the port. May turn your pipes red as well. That may have nothing to do with your problem but who knows?
