[RICK LAKE]

Elmariachi Jim it sound like a leaking head gasket If the motor was overheated 1 time it is possible there is a spot for compression to leak into the coolant system. You don't always get alot of bubbles. This is the problem with aluminum heads and iron blocks.
The other thing is the water pump, Edel has 2 different ones. One is a high flow one that comes with a plate on the fins of the impeller inside the housing the other one doesn't. If you are careful, you can pull the back cover off the pump and see which one you have. DON'T rip the geasket.
I know there has been a couple of threads about AUX fans in the front of the radiator and how much flow they help or slow down. ERA sell there cars with a deflector and only 1 good fan. Alot of guys are having no problems with over heating.
The simplest thing to do is get a good pressure tester with a long hose and install it on the rad fill neck and go for a ride down the road. See how much pressure builds up in the system. This is an old trick that some guys used on there motors for racing. They know when the motor is about to toast with higher pressures. Simple and works if you have a base to start with. I think you have a pin hole and the motor seals it when cold and when hot cooks. A would also have the heads checked for straightness if you end up going my way. HEY just had a thought, Check the system out and put some DEX in the coolant system and see if the high temps stops???? Mom pasted last night, later. Rick L.