CAR HUNT! or BOF & me car shopping!
Looks like a good score for the money. If it was me, I'd probably keep the engine & tranny (200 six is a helluva motor) and start looking for a Fox-body to put it in. I had an '81 Rustang and loved that car. This thing doesn't even have a hatchback- what good is that?
As for the rest, I'd laugh all the way to the bank. Tell ABB to be patient if she really wants a Mustang.. they made 409,260 2-door coupes in '65 alone, finding one that isn't a heap wouldn't be hard.