Right Amount Of Coolant

[AR_Cobra]

I was having an issue with my car and decided to replace the thermostat. After replacing the stat and putting everything back together I researched on here how to properly add the coolant. I have burped the system in other cars but didn't know if that works on these due to the cap being on the expansion tank. I read one post that stated to loosen the temp bulb for the water gauge on the manifold and fill the car until coolant leaks from there. I did exactly that, took the car around the block and am having the same problem as before. I normally turn the fans on when the gauge gets to 90'C. When the fans come on it usually drops and stays right around 80'. The other day after driving around for about an hour, as I was heading home I got on the car a bit on a curvy road near my house. I noticed the gauge reading 110' and panicked. While babying the car home I watched the gauge drop back to 80'. Pulled in the garage, lifted the hood and noticed antifreeze every where. After my test drive today (with replaced stat) I monitored the car. When the gauge reads just over 100' coolant rises in the overflow tank and spews out the cap. Once the fans come on the level falls in the overflow tank. At 100'C on the gauge I am only getting a digital reading at the thermostat housing around 148'F, plus the radiator cap on the expansion tank doesn't even feel hot. Minutes after shutting the car off I can remove the cap and the expansion tank is empty. I'm starting to think I am not running enough fluid but need some advice. This has happened a few times before but it seems only after I had a friend's shop replace the cam. Maybe they didn't properly fill the coolant either?