Big Block Exhaust Manifold Comparison?

Has there ever been a dyno comparison between the A-body “super restrictive because, well, look at them” exhaust manifolds and the B-body “look at me, I sweep all of the way to the back” manifolds? You would think it would be easy for one of the magazines to do on a dyno. EVERYBODY criticizes the A-body manifolds but most of the critics have never owned a big block A-body.