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It depends on the year. For quite a while the points could be accessed through a little hole on the side of the distributor cap. The points were installed "close enough" to get the engine started then you would use a "dwell tach" to set the points through the little hole. But for the record, newer GM engines don't use points.
The "dwell tach" the previous poster is referring to is a combination tachometer and dwell meter that can be purchased at most auto parts stores. The points should be set for 30 degrees dwell. Most GM cars stopped using points and went to HEI around 1974.
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