B carb problem

Need some Fordbarn input. Been rebuilding A carbs for years but new to "B" carbs. My Model A runs fine on her "A" carburetor - just completed over 600 miles to Texas Tour and back. She had brumfield head with B cam. Heree is the problem. In order to pick up a couple more Horsepowers i have installed a reamed out A intake manifold to 1 and 1/4". Rebuilt two "B" carburetors using Sacremnto Vintage "B" kits. Main Jet metered at 146 cc/min, Cap jet at 400cc/min, idle jet at 49 cc/min, compensator at 115 cc/min and power jet at 115 cc/min. These are numbers supplied by SVA and re checked on my flow gauge. Installed on the model A and get awful results. At idle she does OK, but top speed of 50mph and at 45 begins to caugh, spit and sputter ad if running out of gas. Both carburetors get same problems. Any suggestions?



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