Point gap affects dwell angle but doesn't equal dwell angle.
Generally dwell shows up about 50% duty cycle and the angle depends on the number of cam lobes. On those distributors made for easy gap adjustment while running, a dwell meter works. All the Delco gas tractor distributors I've seen don't work that way but you have to set the gap with the cap off the distributor and it can't run that way.
When setting the gap (on a cam lobe top), there is usually some specification (.022 for the two I own) and increasing the gap decreases the dwell.
After you set the gap/dwell you have to set the timing because changing the gap changes the timing.
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Today's Featured Article - Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
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