If you want what I would consider even close to "accurate" flow data from carbs, they really should be flowed with all barrels at the same time, at full capacity(1.5"hg). And that means you need a big honkin flow bench.
And even better yet....... Wet flow tested.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads