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Again, what baffles me most is that I had the same issue with old motor, trans, torque converter set up.Exactly the same.

yeah me too & we're gonna laugh when we find it. & no excessive voltage drops/probs/ in the ign1 (run) circuit/components. What is related between the 2 engines?? EDIT to b clear they both vibrated in neutral parked in your driveway right?

Yep, parked and in N or P. I don't know if I will laugh when we figure it out or scream! Yours is harmonic or vibrates all the time?

Facts are stubborn things.