A good buddy of mine has a similar set-up making the same power... sbe with stg 3 cam. His car is light as hell too. 3100 with him in it.
I went away from N/A a couple years ago, as i like the extra power :)
Hey I sold my LS7 and went with a different set-up because, like you said the LS7 doesn't like boost for obvious reasons. Mine is a stroked and fully built 5.4... set-up to support over 30# trickflow heads, longtubes, o/r x, corsa axle-back, Fore triple pump set-up on E85 1- 450lph primary...