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Update: made it to Nacogdoches, TX. Brought it to the mechanic Bernd Ramspeck (highly recommended by various sources). When I pulled in he listened to the engine running for a few minutes then told me to shut it off. First he said the radiator is kaput (yes he is German!) so he will pull it and have it recored, also will inspect and test the CAC, and change the thermostats. He also said he believes the turbo is going out. So once it cooled off he pulled the hoses and inspected it. There are chips on the blades and scratches on the housing and the shaft is wobbling pretty bad. So he will put in a new turbo. He also will set the valves and check the injectors, etc. since he said by looking at it that has never been done and it is time.
The parts should be in Thursday so we'll put it in his building and it should take a week to finish. Fortunately we made it out of the mountains and got here without having the turbo go to pieces. You can bet I watched the gauges and kept a raw egg under my right foot driving here!