It sounds like your thermostat isn't opening. Try removing it temporarily, and see if the circulation improves, but don't run completely without it, as it also controls the rate of flow through the radiator. Most stovebolts need a 160 or 180 degree thermostat. The 195 degree stats didn't come into use until the late 1960's when manufacturers started using high-pressure cooling systems and higher engine temps for emission control reasons.
Jerry
