So what's this '71 Demon worth?

Like said, add up what YOU will have to spend on it to be happy. Add that to your buying price and offer. That is how I figure a car whether it is a project or a "done" car by someone else's standards. Little thins are expected, but a repaint by shop is huge!!!!!
I still say, anything the seller gets over the price of scrap is salesmanship!!!!!