ALWAYS set dwell first before timing. IF you do timing first, then dwell, you're going to have to go back and reset the timing.
Both of my Motors Manuals from 1970 and 1972 list the dwell range on every Pontiac V8 to be between 28-32 degrees. I've always set mine down the middle at 30 and "fahget about it".
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Just a blind squirrel looking for a nut.
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