I had this overheating problem in my 65 sedan and I think I have it solved. Since the car only has a 194 it didnt make sence to me to have to install a heavy duty radiator. So I decided to install a mechanicla temperature gage so I could have an idea of waht the real temperature of the coolant actually was getting to.
I installed the gage and thre days later the car almost did not get me home. I checked everthing and as a last step I decide to pull the distributor cap to see if something funny was hapening to the Pertronics unit.
As soon as I had the cap removed something did not look rightas I had indexed the engine so the rotor should have been pointing to wher the number one distributor nupple was or at least be 180 degrees off. I grabbed a hold of the rotor and ther was all this wobble......
Hmm I thought I had just replaced that distributor...........turned out it was twenty years ago and in that time the danged roll pin holding the gar in place had worn plum clear through......
At least it just took a quarter part to get back on the road......