Minnesota Dragways closed in '76 I believe and the Demon is a '71? That gives you about a five year time frame for finding pictures. Probably a lot less if it wasn't raced when it was new.
Yes, he raced there and Amber Green 73-78/79 ish. He did attend one of the big KDWV ??? Radio events. They announced a Demon with a 440, everyone came to look, then walked off as it wasn't pretty!