<<The article said the solution to this problem is to
use a large airbox with an automotive-type round filter to settle the
air down before it enters the servo (my paraphrasing).

Lee "Moondog" Metcalfe>>

In the old days of V8's, carburetors and round air filters the filter
element was a very important component that evened the air flow around the
carburetor inlet.  The radius at the inlet was also very important (although
some can be found with sharp edges at the inlet, which was used to correct
metering deficiencies of the carb itself).  I would bet that you could get
nearly optimum ram effect with a well-designed air box and allow staying
with the updraft throttle body.  I could sketch some ideas if you like.

Gary Casey