I use to do a lot of flow work on carbs and air
filters and assorted components for Chrysler.. I had
to use certain things to get the base line.. everyone
had to have the ideal entry on it(like a velocity stack)..
I put one on my carb in the scoop.. it does make a
difference to the air flow... on my scoop the ideal
entry top is at the bottom of the inlet opening.. it
has plenty of area to turn 90* and then smooth out the
air before it hits the carb... in my set up the scoop
is sealed... all in all I believe my carb top is 6"-7"
below the bottom of the scoop entrance... it surprises
me how some try to get the air to turn 90* into the
carb in less than a couple of inches.. then no area for
the air to smooth out.. just so they can use the factory
style hood scoop