once you set the initial timing the mechanical advance (centrifical) of the distributor should increase the timing in the neighborhood of roughly 20 degrees. You are saying that your initial is 30 degrees and total equals 36 and that would lead me to believe your mechanical advance in the distributor is only providing six degrees advance. A little early in the game to say there is something wrong with the base plate in your distributor so best to have you rerun the tests and get some numbers. I definitely would not have my initial at 30 degrees.
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1968 LeMans conv. 350 HO - 4 speed triple white (hear it idle here) https://www.youtube.com/watch?v=eVmq...ature=youtu.be
1968 LeMans conv. 350 - 4 speed Solar red/pearl
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