If your really looking for a total resto those manifolds are not correct for your car. They are the wrong year and casting numbers.The one's you saw on ebay are correct. They are getting harder to come by and that guy's price isn't out of line.
This is right if you are looking for exact 1970 manifolds mine are not for you. If you are looking for just manifolds to replace the headers then mine would work. I also recommend the REMFLEX gaskets that someone brought up.