My gut says these have got to be the very last run from Dalton, I'd like to see the foundry mark.

If you got any shots of the label, I might be able to figure out who machined them.

machining wise, the story I was told was Royal Oak Boring up and quit, but who knows...maybe they didn't get paid or didn't get requested increase, or similar business failure. My cousin John actually works for ROI (I for industries...cute eh?)but he never did anything on the Mopar Programs.