Holley 500 CFM 2 Barrel #0-4412S on a Slant 6

From another forum:
"By my calculations, a 500cfm 2bbl would equal a 353.55cfm 4bbl."
http://speedtalk.com/forum/viewtopic.php?f=1&t=25485

I'd like to change my answer to the 500 lol
Unless you're putting this in a tractor