after the engine gets to about 180 or so ,see if you can see the coolant moving in the radiator,check the rad hoses to see if they are sucked up flat.(has to have spring in the bottom hose) have the rad checked for flow and cleaned if needed. check to see if the fan blade is the right one and not running (backwards) and pushing instead of pulling.check the timming to see if your not to far (advanced)
dave