Ford D3NN9430B Vertical Exhaust Manifold For 5600, 6600, 5610, 6610
Military surplus Ford manifold in OEM packaging.  
Does have some oxidation as seen in the photos. 
Verify with Ford this is the right part for your application before ordering.
Please see pictures

APPLICATION: 5600, 5610 EARLY, 6600, 6700; (1975-1996).

ALSO: 555C, 555D, 655A, 655C, 655D LESS TURBO; (1975-1996).