That manifold pictured is beyond a Vanke mod. So that is something someone did on their own. Pictures available of how the Vanke mod looks on web. I would get a street manifold if you can. I don't think that marine manifold was good either.
Yea I agree that’s someone’s failed attempt at a vanke mod hence the reason it’s not on the engine. I will keep an eye out for a factory unmodified intake.