Some vacuum advance distributors were designed to run via a spark port timed vacuum off the carb, while others worked off of manifold vacuum. The advance strategies between the two of these is polar opposite of each other.
You need to put a hand vacuum pump on your distributor diaphragm and watch your timing marks with a timing light to see what mode distributor that you have. Then you can hook up your vacuum line according to what you are looking to accomplish.
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