memike found a 66 dart
Ah yes, I remember that '63 for sale on here. I like that one a lot, but I can see it had problems and was probably more work than you're looking for.
I wouldn't trust the guy to look underneath and give you an honest opinion, I mean he's the one selling it! Conflict of interest, don't you think? Go look yourself! Take a flashlight and look hard. Take some digital photos and post them here for us to look at and analyze. :-)
I don't know where you live, but there's a '66 Valiant (canadian one, looks like a dart) for sale here from a guy I know. It was owned by some Nuns. Very good shape, I think he wants $5000 cdn for it, but it's really rust free and ready to go. It's a /6 though, but that's not hard to change. In fact, I have an early a-body V8 centerlink I'll give you if you need it.