Here are a couple of links to the car.
https://levelonerestoration.com/port...1968-rs-yenko/
https://goodguysnewsarchives.com/68-yenko-camaro/
It spent a good bit of it's life in England where it was found sitting in a pole barn with an old Ford drag car. It was shipped back to the US in a container in 2008 or so. The guy who brought it back to the US may have been from AZ.