Dougs Underchasis Headers

I bought some guy's project car a while back and in the trunk full of parts was a set of Dougs Underchasis Headers for a 64-66 A body in the box NEW ! I was planing to build up a 65 valiant 2 door sedan and use them with a 360 ,4 speed , and 8 3/4 323 rear but now I have this nice vert and I'm thinking of just making the Valiant a daily driver and selling the headers. Does anyone here have any idea what these things are worth? I saw some on e bay for aroung a grand and I just couldn't believe this.Could this be true? Thanks