Big block cooling question

So I have 383 in my valiant and I am having cooling issues when sitting at too many stop lights gets up to 220 I have a new aluminum water pump,new aluminum 2 core radiator with 1" tubes I have a 165 degree thermostat
I've tried a 195 that made it worse so my question is I put a under drive pulley that is 5"in diameter and my aluminum water pump pulley is 6.5"in diameter will that make my antifreeze circulate to slow to cool. any ideas would be appreciated thanks