In good clean, running road-worthy but not concours condition, that bike will easily bring $6K. But the tough part is that parts for them are both harder to find and rather expensive, and there are generally fewer people around who can competently work on them. IF you've got plenty of cash on hand for a project, I'd say "go for it"! If you are, or have a good friend who is either experienced in these bikes, or the /2 model, or perhaps is an expert airhead mechanic, then you could probably figure it all out given time and patience.
They are beautiful when tuned up and shiny, though.