And me...
If you take a 5.3 and give it full bolt ons, and tune it to its max potential, then take the same parts off that 5.3 and put them on a 6.0 tuned to its max, you will see far greater results.
a 4.8 can put out 600whp... but if you take your setup and put it on a 6.0 of equal compression and flow.. you can make that power with less boost. Not to mention the butt load of extra torque you'll have on tap.
everything destroys the 454 BB... but technology is not the only reason for the power difference, because we all know the BB can lay some power down that LS cant touch. But thats a separate issue.