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If there is any metal to metal contact between the subframe and the body that would transfer engine vibration inside the car. I really don't think the transmission mount is the problem unless it is somehow making metal to metal contact.

If they are using modern equipment for OBD2 to diagnose a 1990 Reatta, they won't get a result. Maybe they are looking at exhaust gases in the coolant? It seems we have statements made but the evidence of how the conclusion was arrived at is missing? It seems the shop is blaming a mechanical failure when the evidence suggests a sensor or control malfunction. I don't understand how a headgasket could be diagnosed without documentation? Leak down test, compression test, exhaust in the coolant or coolant overflow from being pressurized by cylinder compression, coolant in the oil. What's the evidence?

I had two Chevy impalas with the 283ci engine in the late sixties. They had canister oil filter housings at the bottom near the oil pan. Twice during my ownership when changing oil and filter, not knowingly I miss-thread the filter canister, put in 5 quarts of oil, and started the car. Five quarts of oil gushed onto my dad's driveway...what a freakin' mess!