FTF,
I was guessing the CFM of the BV carbs but the numbers I gave were in fact at 1.5" Hg. So the midsize carb (140cfm my guess) would be about 200cfm at 3.0" Hg. I've never seen cfm ratings for the B/BC/BV hence the guesses.
Either way I agree with you that a pair of them would work.
I do show the Carter YF used on the 170-200-250 six from about 1970-up (tho some used the Carter RBS), and also the YF used on the Big Six, 240-300, also some AMC/Jeep used the YF.
The smaller Fords, 144-170-200 in the 1960s used mostly the Autolite 1100, close twin to the Holley 1940 as I understand it.
