Edelbrock Air Gap or Performer RPM

I remember seeing somewhere that the rpm performer and the air gap are the same height as the factory 340 dual plane intake. I have a 1972 factory air cleaner and had to put a 1/4 in spacer on to clear the bowls on my holley 750 ultra double pumper 4150 and no spacer under carb and will fit under stock hood and I’m using the air gap intake.