I was going to comment on this being such a good deal and so forth, but something about the vegetation in the one picture didn't look right for Springfield, IL. I thought ok, maybe the owner has the car stored at another property, no big deal. Then I performed a Google Image Search on both of the CL images, and there is a dead-ringer for the interior shot around the middle of this thread:
http://www.mocgb.net/forums/showthread.php?68916-71-Mach-1
The car in that thread does appear to be the same one in this CL ad, and it's a 351 rather than a 429 car, so buyer beware. That interior shot is definitely identical, with the same driver's seat tear, mirrored rather than wood-grain insert on the passenger side door panel, missing metal insert on the passenger side seat upholstery, steering wheel cover, painted door striker, and so forth. I hope I'm wrong but it seems like a CL scam.