Your oil pressure is great.
In addition to what the others have said about a thermostat, you may want to service the breather cap. They can and do get plugged up with oil and combustion sludge after 60+ years of service. Test it so see if air passes through it.
If no air passes through it, clean the breather element with a degreaser of your choice. I soak mine overnight in whatever cleaning solvent I have at hand - usually old diesel or mineral spirits.