Graham,
Yes I definitely think so. DCOE 42 or 45 Webers ( with trumpets) must have been a heck of a tight fit!
I recall seeing photos of the 'standard' Plus 4 using Strombergs with no air filters/ trumpets at all- just an open intake?
Cheers
Yup, in various Morgan books, twin carbs with no filtering whatsoever

Cgeers,