Piston ported engine intake pipes can be very well tuned across carburettors. Best carb position still is as close as possible to the engine, though in straight pipes the carb on the far end or halfway also works.
Across rotary disks and reeds, the tuning gets difficult because the pressure waves are not as pronounced. That is why only short ducts are used in thos engines. The MVVS 26 has a rotary drum for intake timing.