Just found a 68 Formula S 383 Cuda. What's it worth?

That was the first thing I looked for was the manifolds but didn't see them. The owner wasn't there so I didn't get a chance to ask him. I know they are expensive as hell. I know it would be a spendy build. Good thing I do it all so that will cut costs. Yea I though 13 was way high. Just a cool car that I hate seeing sitting in a field. Didn't see if it was the original motor. Looks like it was hot rodded in the past. It had the callouts on the hood. What caught my eye was the straight body with no rust at all! It would be an easy resto if I could get it cheap enough. The guys going off barrett jackson prices. 4 grand or so I'd be all over it.