A 6 pack flows the same air as a true 950 4 barrel carb IIRC. Never seen a 6 pack make the same power as a well tuned 950cfm 4 barrel, rpm air gap or victor.
Victor = race intake, totally different category.
RPM = IMO, bar none the best NEW dual plane intake.
Now if it were only available back in the day. The next best thing IMO is a LD340.
Mathematically, the 6 pack converts to 955 cfm. I’m not sure if that size carb was available back then. I don’t think so. What is the primary sizes of a 950? Larger than a 6 pack or 750? I’d think so but don’t know how things work with venturi sizes and butterfly sizes on all the various Holley carbs.
The one thing I know for sure is there were no trick carbs back then that could even hold a candle to todays offerings. Today, there’s some really nice trick pieces out there.
