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At first I would fill her to the top of the radiator and didn't understand that she would find her own level; which, is just above the core. She would overheat if I sat idling for long periods in hot weather. I installed engine pans to funnel the air away from the inside of the interior and found that now she ran cold due to the improved efficiency of the fan. After researching all of the opinions, I put in a 160 degree thermostat. Now that is the temp where she always runs and the coolant is still just above the core. Oh, I have always had a temperature gauge that I double checked with a thermometer for accuracy.
PS: using the advice of an "old salt", I put a galvanized roofing nail in the top of the overflow tube to prevent any splash out. I can't say that it makes any difference, but it's kind of cool and a tip of the hat to the pioneers.