If I where you I would check the torque on the arp's whom ever installed it probably went with the TSRM 52ft-lb instead of torquing to HKS reccomended 72ft-lb. You wouldn't necessarly have a blown gasket but more of an undertorqued one. After that sit in the driveway and check the coolent then idle with the heater on and see if you get any bubbles in the radiator and check your passanger floorboard for leaks as well. If all that is fine then try to get it to overheat in the driveway by idling maybe you will catch something like a small leak from your TB hoses. It also might be overly advanced timing, reset to stock. Just some simple suggestions.
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