Start with the basics.
Must have a fan shroud
Check that the lower radiator hose is no collapsing at cruz rpm
Use the correct cap
Remove the water pump and do a thorough inspection, make sure it is the correct pump for your application. The water pump needs to be overdriven from the crank.
Is the fan clutch functioning, they can be problematic.
Check out the thermostat is it correct and functioning.
Ignition timing can effect engine temps
Your radiator should cool your engine if it is stock
If you do end up replacing components do your homework and make sure you use quality parts from a reliable American manufacture that provides a good warranty.
Stay away from off shore suppliers that offer up some kind of marketing gimmicks that cant be supported by solid engineering at a cheap price.
Good luck
