[Jack21]

Getting air cleaner clearance on any 351W Cobra is a challenge. And, smaller air cleaners, even the Edelbrock oval, cost HP as I learned during dyno testing.

Best compromise was K&N 11" which filters through sides and top. And, as I learned, the filter element on the Edelbrock oval (a K&N), is also an 11", and fits the K&N 11" top, and is slightly taller.