Dennis, you haven't said why you want it to run cooler. Is it overheating? From what you describe it sounds like the cooling sytem is in good order. If it is overheating, I'd suspect the spark being too far advanced. Far more likely than a good, clean cooling system being at fault, and a much easier fix.
I won't encourage you to go with the pump and no thermostat. Unless you plan to work this girl REALLY hard every time you start her up, she'll never get up to a good operating temperature.
When they made these engines, one option on the tractor was the radiator shutter. It was sold most to the folks with distillate-burning engines. Distillate burns cooler than gasoline, and the shutters were there to impede the flow of air and thus hinder the efficiency of the radiator so the engine could get up to temp and stay there.
Up in my neighborhood, it's not unusual to find those same shutters on gas-only tractors. I've been out moving snow uphill with mine in the bitter cold behind a storm and had a hard time getting and keeping her up to temp with the shutters open.
The thermosiphon and the radiator made for it are that efficient, even in warmer air.
My advice is that you check out your timing before going to the trouble and expense of adding a pump.
(And don't fret about the typing. A lot of folks think I can't spell. I can, and very well, thank you. But I am a lousy typist. I won't tell you the time I spend cleaning up my posts before I push the button, and still the typos get through!)
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