'66 Valiant Running Hotter than Expected

Just trying to get something substantive to start process of elimination.
Is it really hot, does the rad shed sufficient heat, is the rad plugged with bugs, does it have a partial plugged core, bottom hose sucks shut closed on high rpm, - stuff like that . lol

If the rad is shedding 100* and it's still getting hot, and your other car is only shedding 70* and stays cool, ? ?