I have a 604 that is getting up to 220 and sometimes 230 during and after the feature. I am running a 4 blade fan with an all star shroud, double pass griffin radiator, 5/8 restrictor in thermostat housing. I replaced the water pump before saturday thinking it was a little weak and it still got over 220 after the feature. Timing is set at 32. The only thing else I know to do is change out the pulleys, the one on the water pump is what looks to be a 4inch and the one on the crank is a 2 inch. Could that have alot to do with it? What else can i do to try to keep it in the 200-210 range?