Edelbrock Air Cleaner?
LD4B has a pretty tall carb height 4.9" (compared to the performer at 4.6") So depending on your element you may or may not need a drop base.
I ran a factory unsilenced air cleaner (on the ld4b with eddy thunder carb) which required a spacer with out any problems. Later I used a carb spacer and a 3" element which did require a drop base