From what I've read, Some engines were produced per plant records, but none were installed in Chevelles. If any were, I think that there would be at least one documented example somewhere. No one in NCOA, ACES, or anywhere else that I know of, knows of one. I think if one ever shows up, it will be very suspicious and will receive close scrutiny for original documentation. Also, it will be big news in the Chevelle enthusiast community. Just my opinion. von