Smaller water pump pulley

Need a little insight. I have a 72 duster with a 360 magnum. LA timing chain cover. I have an aluminum radiator, new hoses, 6 blade aftermarket fan, with a shroud. I haven't checked timing yet, and I don't know which water pump the car has. So I know those are both variables I need to check.

Going down the road the car holds steady at 180 degrees, as soon as I idle at a stoplight it creeps up to 220+ and then comes right down once I take off again. From reading on here it seems that your...

Smaller water pump pulley
Author: scott2683