Had an air gap on my 70 Dart 360 with an Edelbrock 750 performer, used a drop base air cleaner with K&N filter and Xtreme top. Clearance was ok, but I also had a hoge hole in the hood with an A12 style scoop.
I wouldn't ever use one of those triangle ones with the foam filter again, had one on a truck years ago that nearly went up in flames thanks to that thing.