How about approaching the local press in that area?
Local TV and newsprint sports reporters might like a story like this.
Refer them to your past restoration connection to the Dick Landy car and the print it got, the stories printed about your current ride and directly to this forum and the number of hits/history this story has generated.
Just keep wearing them out until someone gives in. Documentation and pics you have. Show them what it is and all you know about what it was (silver with a dent).
Maybe contact that TV show guy..."Chasing Classic Cars" I think it is.
http://www.f40.com/
He may have some area contacts that could help.
Can't hurt to ask.