Interesting Walt,
I have one of the big puppy's with the V clamp air horn (truck style air cleaner) and yes the bore of the air horn and the choke butterfly are indeed bigger the a regular 94, but the outside dimension of the air horn, the V shaped clamp part is the same size as my 8RT carb, in other words the stock 8RT air cleaner fits on the big one.
The pictured carb is obviously a car style air horn, did these have a bigger outside dimension the the regular 94 car style air horn?
Just to muddy the water a bit, I have come across some 94's that have a slightly small air horn outside dimension than standard, a stoke Ford car style air cleaner doesn't fit, and won't clamp on the horn. Never worked out why or where these odd ball ones came from.
Martin.