awesome setup. never saw one in life.
I instantly thought of the rotax aviators engine. aligning carbs.
home made manometer
and there is a fancy gadget, can't find it..its in video though.
to work it, they do not want the two halves of intake to be connected. yours is like that permanently it appears.
I'll look for vid.
I had a dual timing belt subaru doing that on an optical distributor (no advance retard). one intake.
here is another one. this is not the first one I found. fancy though.