I like its simplicity and thank you for clearing this cast iron contraption up in laymans terms. It increases my enthusiasm to build a simple single su manifold for the A.
Reading the history of Nissan looking for an engine to power the datsun b10, this engine is very similar to the early A10/12 and even the head although Nissan went for the cheaper non-crossflow and wedge CCs, I feel the exhaust side is very similar to the A. Not to mention all the other block featured items.