I installed the later distributor on mine last year and now I pretty well have the carb dialled in as far as jet size.I only have a basic timing light without the dial thing on it.How can I figure out how much vacuum advance I have and how much centrifugal advance I have?What are the suggested settings?What can I do to change the centrifugal settings?This distributor does not have the nut on the end of diaphragm so I am guessing the  vacuum limit can be adjusted with an Allen key.I wish I had put a degree tape on the damper when I had it off last year.Hard to get accurate marks after 10 degrees where the factory marks end.Any input appreciated.Thanks