I'm just thinking out loud here about my 340 build. The 6 pack would run approx $1300 more than the Edelbrock performer RPM with a good carb in the 750 cfm range. I am thinking it might be a worthwhile endeavor to spring for the extra bucks and get the SIX PAK.
I wouldn't mind loosing a few ponies to get the 3 duces, but too many might be a problem. What would be the performance difference between the 2 setups?