How about comparing the factory numbers? The 5.9 was 245hp and 330fp torque, the 5.7 is 395hp and 410fp torque. This comparing truck engines to keep it apples to apples. The 6.1 and 6.4 are another animal.
Don't get me wrong the Magnum head is the best "production" small block head Chrysler made. There is a reason Chrysler moved from the Magnum series to the Gen3 though, the Gen3 is more efficient, it does more with less, and yes it is a much stronger platform.
