Yes, other details that separate dogleg castings from rectangular castings, which I'm putting together photographically, will bear this out.
I would like to find out if there are further pictures of the engine bay from this series. It appears the original photographer used a lens filter which rendered parts of the same color as very dark, so dark that there are little to no detail features in the shadows despite using Photoshop and the like to pull those features up. The cylinder heads have markings that differentiate between dogleg and non-dogleg. Without the detail in the cylinder head shadows though, my conclusions will center entirely on the exhaust manifold details.