What should my timing be set at to stop pinging at wot

jerry6 said

Adjusted the distributor with allen key , was not getting vacuum advance at 2000- 2500 , there was almost no vacuum from the port on the carb.

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Wierd. You should have close to the same vacuum on both ports at that rpm. I wonder if there's some internal issue with the passage in the carb. What is your idle rpm? Is there "0" at idle, and something at like 1500? Or zero vacuum all the way up? Have you tried jetting or power valve?