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As Fleetwin said, the ’79 has the water pick up forward on the gear case. It is kind of hard to get ear muff flushers to seal tightly on them. I, too, would put forward the simple idea that maybe you just don’t have enough water flowing to the flusher from the garden hose. Sometimes I tie the muffs on so they won’t lift and move around on the gear case and open the garden hose supply quite wide.
Outboard cooling systems are designed to drain out when you shut the motor off. It is sometimes possible to supply so little water that the power head drains as fast as it fills. The result is exhaust in the cooling system and sometimes, it will come out the tell tale hole.
As for running this motor without the thermostat, it is under a whole water jacket cover and would be a pretty big operation to just take it out, for a test. Is there any way you can test the motor by backing it into an actual lake on a trailer, to eliminate the ear muff flusher as a problem?
Long live American manufacturing!