Where to start on my 63 Dart?

So what would you suggest doing with it? Try to look for one that is from '63 and pay someone to drop it in, or just go with what I've got? What's that tube that's near the bottom of the block underneath the air cleaner?

I don't know if you saw the pictures in my gallery, but what would you do with the floorpans? They're rusted through in several spots, and I'm not sure about how bad it is underneath the seats.