Big Block Truck Headers/Exhaust manifolds

Looking for information, or even a set, of big block headers or Exhaust Manifolds for my 1970 D100. I have made the decision to remove the 440/727 from my 77 Winnebago and decided to put it in my 72 Dodge half ton truck. SO far, I have been unable to find a reasonably priced set of headers for my truck :(

Any information will be greatly appreciated.

j

Are you looking for big block headers for the 70 D-100 or the 72?