What I'd love to see just for posterity is what that GG White Book says a little further down -- what was the actual manifold that came in my car -- 72 A-Body (swinger special)
Here it is for 73-74 A body left side 318. The GG book doesn’t show a 72 318 A -body left side manifold. So maybe it is correct to have the 70-71 on there.