1976 Dart Overheating and other issues

Also, I am thinking of changing the three belts. When i accelerate the car in park or neutral, i do here a belt screech. No leaks from the water pump area or coolant leaks in general, so I'm thinking the water pump may not be spinning as efficiently, although the belts do seem nice and tight

With belts off see if water pump is able to turn and you should be able to hear some fluid movement.