Tommy - he has a 250 rather than a 235 (crunch, crunch, crunch) so the requirement at 100 percent volumetric efficiency would be 289 CFM.
I would guess maximum V.E. at maybe 85 percent?
So required CFM would be 245.
But your points are quite valid, both as to required CFM and cylinder fill density.
As far as the multiple setups, due to the port configuration of the Chevy 6, three carbs are preferable to two. Size would depend on the manifold style.
Jon.
