How fast is the engine running and hard is the engine working? If it's running at full speed on with a load like a feed grinder or pushing heavy snow, it should be throwing plenty of heat out the radiator. If it's only idling with very light loads and the cab heater is set on high it could have trouble reaching operating temperature. Are you using a block heater to warm the engine before starting it?
If the coolant level is good and it's working hard enough to throw heat out the radiator, it does sound like a thermostat could be stuck open. An easy way to test the old thermostats or new ones is to dunk them in boiling water and watch them open and close properly. If they are OK I'd check the gauge next.
Anything is possible on a 40 year old machine, check the simple/inexpensive things first.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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