My home made cold air/ram air outfit is similar to what you describe. It has 2 4" ducts coming in from behind the grille between the headlights and the radiator mounted in the radiator support.
My carburetor is surrounded by an enclosure made from a 33 gal drum that encloses a 3"X14" K&N filter.
I think this thing lowers my ET by maybe .1 or so at the track.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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