I listened to the videos of the engine and I do hear some rhythmic noise. If God forbid, I was stuck working on a situation like this, here is how I would proceed. 1. Go ahead and swap the distributor for a known good unit since this was a known problem area. If that does not work. 2. Remove all the belts and run without any of that stuff turning. If that doesn't work. 3. Remove the fuel pump and run without it. Use a block-off plate or even duct tape. Only needs to run for 20 seconds. if that doesn't work. 4. Remove torque converter bolts and push out of way. Run engine. If still the EXACT same noise, put everything back together. 5. Run engine again and remove one spark plug wire at a time to try and isolate the noise to 1 cylinder. If that doesn't work. 6. I might wave the white flag at that point. But I am not easily defeated. This is obviously a tough one.
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