From what I have read and observed about the C & F model CVKD 40s, they're longer (intake to outlet) than the E's CVRD 40s. Other than that, their spacing will fit. You just need to figure out if having them sitting lower under the airbox will present a breathing problem when you match the carb's intake plate with the lower airbox half.
Personally, I wouldn't want the headache. Match CVKD to CVKD. :afro