oil pump failed

Not worried about the priming tool. I’ve seen guys use stock oil pump drives with a high volume pump and shear the hex drive off so clean it didn’t appear damaged, till you measured it and compared it to a new one. If you give us a good measurement we can measure a good one and compare lengths.

really? hmm my (what i think is original) intermediate shaft is 8 11/16", the tip is beveled not square but it looks like it was machined that way or at least not done recently.

Was there a new bushing installed/reamed/burnished?

it's wicked shiny inside and out ??? If the motor goes back to the machine shop, it'll be the on the list of questions I ask.