"Charlie" has Overheating probs- Here are my Clues and please chime in with opinions!

I knocked out rear freeze plugs and removed chunks of crap half the size of golf balls.
Between the rust sediment and stop leak products poured in the radiater by the previous owner ( annually since engine rebuild in 1984 ) its no wonder it ran a little hot.
I had the radiater properly repaired and replaced the 7 lb. weak system cap with a proper one.
Problem solved. OEM 4 blade fan, no shroud.