The fact that a six-pack is not simply "325+350+350" cfm flow rate (sum of each of the carbs), you have to convert the 2-bbl flow rating to the 4-bbl by dividing by 1.4 so in this case it would be 1025/1.4=733 cfm. Might look small but the Mopar six-pack has proven to work well it is a good design, still beats most 4-bbl setups from the day and I believe there are bigger carbs you can get specifically for 6-bbl setups now.