Here's my grey matter 3.2 prediction.....

On a "typical" 493/505/520 bracket or hot street type build, with normal compression ratios(10.0-13.5) and cam lift/duration(.550-.700 lift, 250-280 @.050) running a single plane manifold with a properly sized carb, and the proper sized headers for the application, the TQ peaks would be within 500rpm of each other if you changed ONLY the heads and intake manifold.