I'm going to go out on a limb here and say that there are "tons" of members who visit the HAMB who are like me, pretty well versed in things automotive, have had great cars, have had the street machines, have the needed knowledge to keep them up to speed and running like they should, and yet still come across issues/things not understood and "fake it to make it." In changing carbs and searching for the constant high rpm miss that I finally was able to find and fix I now know about and understand there is ported vacuum on some cars and the difference between that and common vacuum, and why the need. I have always just blew through the "advance" needs, basically understanding it but not really. I had no idea that there was "ported vacuum" and when coming across the term in the Edlebrock manual I also just blew it off thinking "hey vacuum is vacuum" and went merrily on my way. Well over the weekend my guy Jim the REAL Deal mechanic came by to see how the car was running. I told him it needed timing I thought. When we moved the rotor two positions clockwise last week he tightened the distributor so much I could not turn it, (arthritis pain) the bolt holding it was to tight. Well long story short we got it done. He mentioned the ported vacuum thingy also, so I went to MR. Google and now have a more informed knowledge of timing and the difference between the two and that I have mine advance plugged into the wrong vacuum port coming off the rear carb. Now off to get it hooked up right and get on with the hobby and things to learn that I have just passed over in the past.