My 496" Fairlane ran its best time with Jay's adapter and an Edelbrock Yates dominator top. Unfortunately I don't have a controlled experiment where the only change was the manifold. Joe Craine ported and flowed my combination and it would move more air than the ported Victor that was on the car.
An Edelbrock Victor 427 is a really good intake, so I doubt you're gonna pick up three tenths just by moving to the adapter and Cleveland intake. Keep in mind, many people smarter than me have expressed the power an engine makes isn't necessarily equal to the sum of the parts; its having the right combination of parts that work well together.
I like the improved ease of maintenance and flexibility that the adapter provides, plus my engine seems to like it, and it looks freakin' cool!