I know this is of no real help, but for what it's worth here's the story. There was a local '66 Hemi Belvedere that was wrecked and rolled. It was in a junk/salvage yard in the early '70s when the hemi was removed and installed it into a '71 383 'cuda. The original owner of my '70 'cuda and his brother were the ones who did it.
No other info, but figure it might help if you had a "note" on one possible example that is no longer with us.