[Texasdoc]

Thanks for all the replies. I'll set the timing back to what it was. For some reason, I interpreted what I read to say to set the timing to best vacuum as well.

I do have a fancy timing light with the dial-back feature, but the MSD 6ALs multiple spark thing makes it not work. I have a cheap light that works fine but doesn't have the dial back feature. I use a combination of them both to check idle and total (initial plus mechanical - vacuum advance disconnected). I have a 360* timing tape on the balancer and use a vacuum pump to test the vacuum advance.