Hot 318
All good recomendations,
Also if you dont have a carb spacer,get a 1/2"-1' phenolic or wood spacer.
Helps cool the carb.
Also wondering what kind of shape your Rad/ heater core is in?
Most heat issues are caused by a radiator that isnt flowing as it should.
Lose the flex fan and go with the stock fan or like Rumble suggested the viscous fan.
A lean car will run hot,plus as stated check timing.
All in all if your car is in proper running order it should run cool with stock parts.