Ld4b early edition manifold

Well I looked up my heads and they are the right casting.
2843675 273/318 1968-74 1.78 1.50

So my other question is if you look the underside of the manifold there is a hole in the rear for the dowel on the block. On the front rail there is more of an indentation could this possibly not be letting the manifold sit down low enough to bolt up?