The thing to beware of is too much prop load on the .40LA. Also, too restrictive a muffler. The TT Cyclone 11-4.5 would be the biggest I'd try. My guess it it'll work very well, because I've seen it work nicely on a .40LA. The APC 11-4...maybe, and the 10.5 x 4.5 is also worth a shot. Use muffler pressure. Most everything works well with a .272" bore venturi with a .156" spraybar through. Apparently, some .40LA's had boost ports, and some did not. The ones without should be easier to deal with. You could block the boost port easily enough, with JB Weld or a fitted block of soft balsa.
Personally, I didn't like the stock rear NV setup on my .25LA. I'd choke it and get fuel into the engine, but it would run out of the hose and would quit running before it drew fuel back up to the venturi. I'm sure it'd work fine with an "electric finger", tho. I've also seen some frustration with the plastic backplates, and I'd rather not deal with that...but they can also work ok, until they don't.
Steve