Inliners International Forums General Discussion Engines Mopar dual carb question

What's the manifold's bolt flange width?
The smaller engines need the #2 (2-11/16”) SAE flange for a bolt-on small carburetor.
The Rochester Model "B" from a Gen-3 (later) 194" L6 looks pretty good, 1-1/2" throttle disc with much smaller 1-1/16" venturi.