There is a lot in the design ov the air cleaner itself. The difference between running a stub stack atop the carb without anything else and running various air cleaners, from stock design to cheap aftermarket design, from 3x10" to 2x14" to 5x14", from paper to K&N were notable enough for me to ditch the thing altogether and risk sucking whoknowswhat down an open stub stack. One ov the many 'tricks' on that car... though you'd probably be mad to daily drive a car with essentially an open carb on any engine you had real money into. Had i been really gambling, i'd have found a way to 'flow' the hole in the hood into the stub stack and then be only sucking in cold air on top ov all else... but that would be literally asking for trouble with an open carb. Maybe for track only...