The guy you are speaking of is Larry Demers. I knew him back in the 1980s when he was a very talented guy running the machine shop at the NAPA store that he was/is a part owner of. Back then he had pictures of a Hemi Challenger that he had previously owned and maintained. In the past few decades I think he has been running a large displacement big block Chev in super/comp.

He is familiar with the Hemi and he has a ton of experience as an automotive machinist and he does hot rod stuff.