carter afb: fuel disappears?

a higher float level might help. i found i could run AFBs at 5/16 float level. i had a 1965 300 L 413 all stock run 16.00 ET. the plugs was a little lean. stock float level was 7/32. but 5/16 made the plugs color right. i know the books all say that float level will not change the amount of fuel flow. WRONG!!!!