Thanks for all of the suggestions.
I tried the Bars Liquid Aluminum from Meijers Store anyway, they were out of the Copper. I also put a little permatex blue around the seal too. No leaks. So far it's not only working, but running a little cooler too. Probably because I cleaned the radiator and flushed out the entire system. It's also possible the heat from the tube and exhaust made the gasket more pliable. I stuck a small screwdriver in back to shove the o-ring up where it was showing (burned my knuckle too on the exhaust). If it does leak again, I'll try to pull off the tube. I've been driving the car for three days now and no problems "Knock on the wood"!
Ben