Sounds like it is NOS, but if it were me, I would go ahead and put it on your vert. Verts are very special cars, and I would try to do the best I could to use original metal. As far as value, I don't think you will get a whole lot more than you would spend for a repop, unless the 1 in 100 buyer comes along who is doing a full, all NOS resto and will pay top dollar for it.