Engine/drivetrain vibration?

You guys probably think I'm some kind of a nut ball with this continuing saga! Frankly, I'm about ready to kill all of the parties involved with this rebuild. Anyway, here's the latest...

- My repair guy just called. He spent an hour in the back area of the machine shop, quizzing their guys about this job. It appears there is NO record of this engine having been balanced as part of the rebuild (even though the final receipt lists "balancing" under the work performed). The machine shop has no notes or records concerning this job, and the guy who performs most of their balancing has no recollection of balancing my engine. Thus, my repair guy now believes the engine was NOT balanced as part of the rebuild

- The shop that performed the original engine r&r on this job has confirmed that they did NOT send the torque converter to the machine shop when the engine went in for the rebuild

- Based on this scenario, it is very possible that my '73 340 was not rebalanced to a neutral balance, ala an earlier forged crank 340.

- The next step? My repair guy wants to pull the torque converter and send it to his tranny shop to have it evaluated. If it appears the torque converter is defective, then we might have our culprit. At that point, we would just installed the correct, balanced TC for the '73 motor and hopefully that will correct the vibration.

- My repair guy is also going to confirm if the existing balancer is correct for the '73 engine. We need to eliminate that variable, too.

The problem with all of this is there are no clear records on what was done at the machine shop. That means we're just fishing for a solution. Frankly, I'll be very worried if it ultimately becomes necessary to pull the engine and send it back to this machine shop to have everything redone.

What a mess.