Stop in for a cup of coffee

straightlinespeed said

I believe the 340's had 10:1 compression if I remember right. But people buy the manifolds and throw them on there engines and are able to get the them to run good. So I dont necessarily believe that the higher compression is what allowed it.

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The six pack is a very different animal than a 4 barrel. The center carb is the primary and the end carbs open later in the rpm curve. It works so well and high cfm because it is staying in balance across the rpm range not just at the top end. If they had simply used a 4 barrel at that cfm it would have been a complete dog at the lower rpm.