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I make funnel cakes on my intake. What size cowl do I need for that? :D

Seriously though: Install the intake. Run a string from one fender to the other. Measure the distance from the string to the highest portion of the intake then add half an inch (more if you're using a hood liner).

I don't think anyone is sitting around measuring intakes and creating spreadsheets for intake height. Might be a good thread though! :)
put a straight edge off the cowl then measure to highest point... if its EFI you dont need much clearance.. if its a carb id leave atleast a 2-3" gap