Stock49,
I do see how a restrictor would help lower the CFM available, but I don't see how it would increase velocity past the venturies to promote air / fuel mixing.
Now that I have slept on this a couple of nights I think you are right. While the restrictor does decrease the throttle area and thereby the velocity through the throttle bore - it also increases the ratio of venturi-area/throttle-area effectively slowing the velocity through the venturi . . . which is exactly opposite of what you are accomplishing by diverting all of the primary CFM demands through one bore.
