I ran a 337/adapter vs a 440-2/adapter on a 540 years ago.
With the Indy intake the tq peaked at a slightly higher rpm.

On that motor, there was a pretty big disparity in HP between the manifolds, with the 440-2 combo showing 40cfm more air being used at 6500rpm.

However, on a milder 572 street/strip build, tested with the same 4150 carb and spacer, the difference between a 337 and a 440-2 wasn’t as big(15hp), and it didn’t really change where the peaks occurred.

At the very bottom of the pull(3800), the 337 was up almost 30ft/lbs.