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It also depends on car build #, too. The newer cars have slightly more crown in them to accommodate more vertical space.
On #747, I'm running a dual plane Edelbrock Performer RPM with 1" spacer and a tall 2" K&N filter. Used clay on the back end and still had about 1/8-1/4" of clearance. If I ever go to an Air Gap intake, I would have to reduce the spacer to 1/2".
-Dean
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