air cleaner base needed

Lets sort this out. The normal 65 a.c. (single snorkle) has a 4" afb hole on a base about 16" across with a filter base of about 13". Where does 8 -9 ' come from as a dim? the 67 full size car with a Holley 5" hole still has similar dims 16" across and 13" filter base. The unsilenced base is still the 13" size.

Clarify what you are doing and perhaps some one with the set up will come forward.