My sixpack is a bit of a home made affair on an old Weiand superstock manifold.
i'm using 350s as outboard carbs and they are my primaries. The centre carb I call my thirdary :roflsmiley:and it's a 650 2bbl.
When i build some serious hp I still intend to use the sixpack and I figure I can go to a pair of 500s for the primaries if it is warranted.
You never know till you give it a go!!!