do you have the ac idle increase solenoid on the carb & working? i think ac cars bumped the idle up a bit with the ac on to increase air flow & coolant circulation. just a suggestion to verify.
a 7 blade fan should help quite a bit to increase air flow. & definitely at least try a radiator flush additive &/or back flush the radiator & heater core & add new coolant before taking it out to be disassembled &/or cleaned if its not needed. when adding new coolant consider dropping the anti freeze percentage & add a coolant additive like water wetter or hyper cool.
if this isnt a daily driver in extreme winter temps or is stored in a garage that doesnt get too far below freezing, having higher water % will help cooling, just be sure to verify the mixture & keep it in a safe temp range... 50/50 is good to like -20 or -30 or so, not too many places ever see that cold of a temp.
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