Well, I have an air gap on a 65 Barracuda and a 67 Barracuda, with the Mopar Performance air cleaner (e.g., post 11, above) and have no problem with clearance on either one. Now, if you want to run a tall spacer under the carb, that's another matter.
Here's the one in my 67. Note the decal, because at the time (and maybe not now) there was no 360 pie plate.
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