That is good info. I've got the dual snorkel Rallye hood and a fiberglass AAR hood for my 73. The AAR is on it now and I don't think the induction setup I have on there now will fit under a flat/Rallye hood. I can see the middle of the air cleaner through the hole in the scoop.
For the record it is a 340/LD4B/1" spacer, Holley 650, 3" air cleaner on ~3/4" drop base. It's going to get an RPM Air Gap soon. Going to have to lose the spacer and maybe change the filter to a shorter element if I'm ever going to fit the rallye hood.

Did you happen to measure the height difference between the Air Gap and the LD4B?