Assuming things are the same between '65 Chryslers and Dodges....
Back when I needed one, the big problem turned out to be that both upper and lower hoses were on the right hand (passenger) side. Nobody seemed to do one. In my case, the answer was to fit a later type water pump housing that moved the lower hose to the driver side. That gave me the possibility of using a 22" radiator from a later model C or even B body. They're pretty easy to find.