it helped my 68 satellite,picked up a ET and MPH
with a six pack scoop
i think it is more about reducing hot air into the carb with this scoop
Tex

New best ET 10.259@129.65 .
New best MPH 130.32
Finally fitted a solid cam,
stepped it up a bit more
3690lbs through the mufflers
New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm
Power by Tex's Automotive