[Bill Baer]

A good friend of mine and legend Steve Call ran one on a BBC in S/C his theory was that since he had 8 Venturi instead of 4 that the motor would be less sensitive to air density changes and therefore be more consistent.
Which makes sense to me.
In my experience most guys pick up MPH when they switch to a tunnel ram it simply a better design if you get into resonance tuning theory.