Given that they all die due to premature transmission death, there should be lots and lots of good used engines available pretty cheap for this vehicle. Is it still cost and labor effective to do HG and valve job on the engine instead of just swapping a used low mileage engine in it? Can machine shop also adjust the valves while they have the head with them or all the assemblies are off the head when they get it? I am not sure if OP has ran the test strip test on his vehicle yet. I also wonder if he is still smelling the anti freeze. IF it were burning, he will NOT be smelling it. Has he run the leak down and compression tests yet? And or put the cooling system pressure test? May be he has done all that and then decided that it needs HG but otherwise he is jumping the gun.