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the answer to your question.
1) set base timing to about 18 to 20 degrees at idle
2) Now rev the engine in neutral and see what the timing is. you may want to mark your harmonic balancer at 32 degrees so it is easy to see. Yes it will be loud, at 4000 rpm all timing should be in so if you rev over dont worry the timing will not advance anymore. The advance is controlled by springs underneath your rotor in your distributor.
If you have an adjustable light you set the advance at 32 degrees then rev to 4plusk and you should be on zero on your harmonic balancer. It is critical you rev the engine and dont use a spring curve to calculate advance.
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