Question on 68-70 B-bodies with factory air?

[Blakcharger440]

I am adding factory air to a 70 B-body and I am wondering about the center AC vent (under the radio) plastic ductwork.

There is a little bracket on this plastic ductwork that holds it steady...should it be above or below the dash frame?

[y3chargerrt]

Below, held in place with a phillips headed screw.

[AirborneSilva]

blackcharger440 could you take a picture for those of us whom will be doing the same thing your doing, thanks