Both of my 318/auto 71 Dart's had 8 3/4's from the factory. It was pretty common.
Sounds like it! Couple hundred bucks for an A-body 8 3/4 is a steal.
He must have a source there, or spends more time than I do looking at the pages. I got the email notification today, too late for any of that stuff.
Although, honestly, I don't need any more parts and I'm not very good at selling stuff once I've got it so it's probably for the best!