Picture is not crystal clear but the rearmost gaggle of fittings/lines appears to be where one of the full flow oil 261 fittings would be, (never seen one plumbed that way)and lower on the block just behind the side motor mount triangle of holes appears to have some sort of fittings(?) that are not connected to anything--that is where the other full pressure 261 fitting would be. Maybe it is a 261. I would also look just above the starter area and on the same side of the block behind the manifolds (just below the deck surface-and mid block) for "captain's bars (manifolds are blocking this area from view). to help seal the deal.