Need ID on these headers

Well, I bought these headers from someone off craigslist. They wont fit on my 76 Duster smallblock. (He said they would) Does anyone know what they might fit?
I seen a guy at a swap meet that had the same set, but he didnt know what they would fit either. SO now I have my torsion bars out and car hanging on the lift with headers that wont fit. Any reccomendations for a good pair? I have power steering, I heard that makes a difference.