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The exterior screen, the sheet metal with all the small holes is the restrictive item. If you use a filter regardless of diameter or design that is only 2.5" tall the choke housing if left intact will allow very poor airflow. Take note of the design in the HP series of Holley Carbs sans choke housing and with radiused edges and corners. THAT design will flow a lot more air.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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