Cooling problems come from more than just radiators, what is the timing set at? Is it rich or lean? Maybe the water is running water too fast thru the radiator try running a thermostat.

BTW Lodi apples are the bomb!

56 Plaza 63 D100 step side 67 Coronet, 68 Roadrunner, 69 Super Bees, 69 Coronet 500 convertible, 70 Roadrunner Post, 79 D150 360, and a severe case of Mopar a,d,d