It was a combination of engine timing and mixture that caused my engine to run cool.
In a seperate and unrelated incident, I also had a piece of waterpump impeller from the previous owner work its way through the system. That caused the engine to run COLD, not just cool. Cold enough that the temp gauge did not even register a reading. The piece of impeller was blasted loose when I rebuilt the water pump, due to the higher water pressure created by the new pump.
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