Not sure I'd want to estimate the cost of repairs. I'd only say that you would need to get it fairly cheap, because I've seen either running or at least 'all there' & easily restorable examples of these go for $2000 - 3000 here in Georgia looking at Craigslist. Finished cars are probably around $10k or so but even those are v8 cars or at least the ones I've been looking at are. The early Barracudas are basically reskinned Valiants, but cool cars especially since most seem to have bucket seats, consoles, etc. Looking at your pic I'd say that would go for no more than $1k here if that. Cool car & needs to be saved by someone, you'll have to decide if that's you! Good luck.
Later, Jim