Torque converter runout

famous bob said

Not sure , but back in the day, I had a drivetrain out of a 68 hemi roadrunner. The convertor was no problem till I started using b-m j convertors, we had 2 of them w/ excessive run out, they would knock the seal and front pump bushing. B-M did repace them tho.
Don`t take much.

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I have a new x block being mated to a newer 904 torque flite.
Because this trans has never been mated to this block, I indicated the pump bore of the trans off of the crank flange with stock dowels
In the block. The runout was .015 thou. Yes 15 thousands.
How many people check this. I used offset dowels from Mopar and got it down to .001. I have seen many people chase leaky seals,worn pump bushings, vibrations and even broken converter snouts, and when you ask them they have never checked trans alignment.
This trans and motor misalignment was the worst I have seen.
Problem is you have to have a gutted empty trans case t bolt on and check.