Re: 4100 carb
Haven't run a 4100 on a flathead but you'd use a Navarro or Offy or other purpose built 4-bbl manifold.
From Autolite the 4100's range from around a 1" venturi to a 1.19....
a bit over 300 cfm to about 600 cfm at the other extreme. The SAE standard would be to flow automotive stuff at inches of mercury, Autolite may have done it at inches of water because the 4100 numbers aren't quite as impressive as Holley's.
Here's an experimental "blower" 4100 with 1.23 venturis-
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