I believe it is of no value since air is actually coming out of the hood scoop at speed since it is a high pressure area as a result of the air passing through the radiator. If this is the case, then the air going into the carb has a much more difficult route to travel than if the turkey pan was not there. I also think this will make the dyno tests inconclusive regarding the turkey pans true effectiveness, since you wont be moving.
If you want to test the air out of the hood scoop theory, take a few drops of
oil and put them on the hood in front of the hood scoop, then drive quickly. Look at the trail the
oil drops make. If they go straight into the hood scoop opening, then my contention that air comes out is all wrong. If it goes the other way or is in a smear pattern (indicating turbulence) then air does indeed come out the scoop opening.