On the factory intake with a 3/4 spacer/adapter to put a Holley on it , a generic 1.5" drop I have plenty of clearance to the hood with a 4" element. A good 2" with foil to check for clearance. I know one of my old NMCA buddies had an RPM and the factory Ram Air pan he grafted a drop base on and ran a 3" air cleaner. Pretty sure 3/4" to vents is OK.
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Skip Fix
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