Well, I discovered that the contact I had with the LS6 owner was not on this site, it was on Team Chevelle. I did manage to find an old PM I had from him on that site, but it was from a year and a half ago. I replied to it, so will see what happens

He had an email address listed in his profile there, but it's apparently inactive, since an email message I sent came back as undeliverable. And there's no one by his name listed on anywho.com either