I hate to be a spoilsport but the key is in the design and location of the thermostat opening. Early tractors and also model Ts did not have thermostats or water pumps or pressurized cooling systems. The coolant circulated via thermo syphoning which is another term for hot water rises in a column of water. Just like in air. Many tractor and industrial engines employed this up to and including the early fifties because their engines were long stroke and ran at low RPMs.
Look at the position of the coolant port on the head and then look at the MT head. MT comes out the top. Yours comes out the front. Your head suggests a thermostat located in the head, as well as a water pump and pressurized cooling system.. If it had a stat, it was a pressurized cooling system and either after WW2 or sometime in the fifties if agricultural.
I'd suggest a four or eight cylinder car of the early thirty's and not a Ford as I originally thought. I've researched the ford tractor engines from 1918 on up through 1957 and none of them had a t-stat port like yours. Ford 85 HP V8 didn't either.