Correcting Mopar Valvetrain Geometry

I'm not sure it's something that adds power. Much like roller rockers, I think getting the geometry correct adds to overall durability and just "gets things right" and there's nothing wrong with that.
There is a lot to that statement that is dead on. The power loss on a messed up geometry issue can be seen when there is a dyno test done. I’m sure there’s some to be picked up. Like the roller rockers, the correct dead on ratio shows a few HP over the not so correct stamped rockers.

When things run correct & right, the engine is now right, all the power you built it for is there and not missing because it is no longer a jenky mess, longevity ensues.