The solution to check is a repro base from Show Cars to match your Edelbrock carbs on a 881 intake.
I think they have them,its worth a call. They also sell plastic adapters for edelbrock carbs -check that -just raises the air cleaner a little ask about them also.
also measure your on the engine center to center spacing of your edelbrocks before you call them. They list the items with the spacing for various intakes and carbs plus give them the spacing on the chrome air cleaner you have, maybe the plastic adapters will work.
You have an original 63/64 chrome 2-4 base from what I checked - I just measured my 63/64 chrome and its right at 6 1/4 to 6 1/2 inches
I could not use my original restored 63/64 chrome 2-4 air cleaner on my 409 original intake when I changed to Edelbrock carbs from the original AFB carbs on my 881 intake.
I have this air cleaner I have on my edelbrocks on a 881 intake -checked spacing and carb size (this link does not have the spacing that I and carb size I have on my 1406 edelbrock carbs)
http://www.show-cars.com/cgi-bin/commerce.cgi?preadd=action&key=6701
Paul