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You didn't overheat the engine. If there is no coolant in the oil (chocolate milkshake appearance) headgasket would NOT be suspect.
You may have a slow leak at the waterpump through the shaft seal. Check the pump for wobble (belts loosened). If yes, then replace soon before it seizes, engine overheats, head warps, $etc.$
If the system isn't maintaining pressure, due to leak or loose pressure cap, fluid will boil off (mysteriously disappear). Just keep some spare antifreeze (even preferably distilled water) in the car.
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1980 245 Canadian B21A with SU carb and M46 trans in Brampton, Ont.
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