By modern automotive standards, the way Morgan have set up the air-box is relatively crude and I can't see why your mod should do any harm. Surely it will allow better quality, cooler air into the system and I really don't think it will affect the resonances of the system.
Is your throttle "fly by wire" and effectively co-located next to the MAF sensor because I can see the MAF but not what I call a conventional throttle body?
