Great read. I have this same issue with my 1966 Tempest with the stock rad and 326 engine. Replaced upper rad hose, t-stat, and rad cap. So far so good. Car hasn't spit coolant since I did this. However, I did buy a new water pump, shroud, and clutch fan, for install this winter.
I read earlier that one of the posters said to make sure that the lower rad hose has a spring in it. I checked and the current one does, but the new one I bought does not. What is this springs purpose and can I just take the old one out and put it in the new one? Thanks for any help.