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I like it. Of course, I've got a gsxr750 ITB setup sitting in my garage, and actually need a plenum like that to use em.
As far as runner length, it looks very close to ideal, but yes technically longer runners improve midrange, shorter runners improve top end. With an engine as relatively large and untuned as the KA (as opposed to a sportbike engine), you could double the length of the runners and probably not see an improvement on the dyno.
In regards to atomization, the injectors atomize almost perfectly - it's the trip from the injector to the combustion chamber where you have problems. What happens if you have a long, smooth runner is the fuel starts to puddle together (think how water drops on your windshield pool together), and that makes for a slower, more uneven detonation. Again, we're talking about a KA truck motor here, not a gsxr1000 superbike motor, so the difference is small, but still.
Good luck getting him to install the old mani again before hittin the dyno lol.
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