An old guy up the road has a '77 Grand Marquis with a built 460 he's been trying to sell for nearly a decade. Ten years ago, he was asking $12K for it, and hasn't moved off that since. It's a cool car, but his is a $4K car at the most.
One reason is that it looks exactly like the Merc that Tim McVeigh used to try to escape Oklahoma after the 1995 Murrah bombing.
Click on the link, it's the intro to the museum. They have the actual car as part of the exhibit: