a lot of years ago, i had a '72 and put a holley 750cfm 3310 carb on. used what ever thickness carb adapter was available and a stock dual snorkel air cleaner. no clearance issues at all.
some years ago i put a holley 650cfm spread bore on a '70. it wouldn't bolt directly to the manifold. the fitting screwed into the manifold for the pcv would hit the carb. added a 1" spacer under the carb for clearance and all was good. also with a stock single snorkel air cleaner.
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