Available adapter to use 340 air cleaner on Carter BBD?

I have been using a new (NOS) Carter BBD (see carb on right in foto) on the current 318 I found on Ebay last year and I know it works well. The '72 Thermoquad I have for later is in an unknown condition and certainly needs a rebuild. After the new motor is broken in, I will go with the '72 factory dual plain intake manifold and the TQ.

Swapping to a four barrel before i am ready will also raise issues with the 904 kickdown linkage, right now it shifts to perfection and I don't want problems with shifts and an unknown carburetor during my break-in period which may be extensive. Besides, my road trips are nearly 5,000 miles each year (and the two-barrel could possibly save me some gas money).