The coolant system on these DOHC motors is a real pain. COBRA90GT is exactly right. One note on burping the car...
Once you've used the method of running the car with the crossover unplugged, cap it off and allow the car to come up to operating temperature (thermostat open) with the heater on high. Once it is warm, shut her down and allow to completely cool. When the car is stone cold, check the level in your crossover tube. If it remains relatively full, then you're all set. If the level has went down, you still have some filling/burping to do. Some get it on the first try, while others have to repeat this several times.
If you still have problems with overheating or burping coolant out of the reservoir, you'll want to replace your overflow cap and overflow tank. In lieu of replacing the tank, you can also wrap the threads with Teflon tape.