I am going to mention something I only heard of recently as a friends 70 Riviera destroyed its engine due to the problem. A "Ballooning Torque Convertor". Evidently fairly common problem back in the day. The Riviera had been cracking flex plates. Number 3 cylinder developed a knock due to rod bearing problems. The crank was ruined at the thrust bearing surface looked as if it had been machined down. All this trauma was due to extreme pressure being exerted by the torque convertor as it puffed up and forced the crank forward. Live and learn. My 65 GTO had a factory flex plate on it that looked like a spider web. I have no idea why it did not implode. Just another thing to consider.
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