Its not fair to criticize Offenhauser because they developed most all their V8 stuff in the late 50s and earlier....but I will anyway. Their intake manifolds seem to be made to accomplish only multiple carburetors. No promoting direction of flow- just a big open plenum with provisions to mount 2 AFB carburetors (In the case of their dual quad intakes.) But again the true dual plane design didn't come about till later and even then Offy just kept going with their original stuff. Explains why everyone and their brother used Offy dual quad manifolds to make Roots blower manifolds.