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Who built your motor - this is a good question for them as they would know all of the particulars. Your compression, head type, distributor set up are all factors in your question. The Webbers may or may not also be a factor. In a general sense - 36 degrees total timing (initial and centrifugal) is a pretty safe setting (vacuum advance plugged). Do you have a dial back timing light and know the specs on centrifugal advance for your distributor?
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