Looking at them, Id pull the trigger. Look at the flange thickness, that looks thicker than many name brand headers out there (Dont let Hooker clown you with their "O-ring" flanges!) reroute the #7 tube and you might have a 64-66 header if you can get the manual steering outside the 1-5 tubes. All headers rust unless they are coated on the inside too. Thats the nature of the heat cycle. None last forever unless they are JEt-hot 1200F ceramic dipped.
