Two GM Small-Block Chevrolet Ram-Horn Exhaust Manifolds

-Two vintage GM cast-iron ram-horn-style exhaust manifolds
-One clearly marked GM casting #336711, RH3
-Casting #336711 is identified as a right-hand manifold for mid-1970s --Chevrolet small-block V8 applications, including the 350
-Second manifold has the same general centre-outlet configuration, but its complete casting number is not readable