I do think that LD-340 will like the extra plenum. While it is a high rise dual plane, the fuel could use that extra inch to atomize a little better. A lot depends in the set up of course!
Some where here, at the forum, I measured the heights of the two intakes and posted them. I do not remember which one was taller and by how much.
I do remember that the RPM's runners where smaller and more stream lined vs the larger more volumous runners of the LD340.