Not shown in the photo, but seen on other early log-type multicarb manifolds are the crossover (equalizer) hoses from the left-side manifold to the right-side manifold. Typically they were just rubber hoses connected by hose clamps to the stubs seen on the manifold body below the carbs.
GTXperience - that setup would be a great way to hide some stealthy FI on a 440.
By the way, going to MATS? Hope to see you there if you go.