Late model GMC torsion bars, leveling

[nailm]

Not sure if this question will do better here or in the Late Model truck section... but here goes.

Does anybody have any experience with a late moldel (2005) leveling kit for GMC/Chevy with torsion bars. I have a 2005 GMC Sierra 1500HD crew cab, and it has the typical nose dive look. It's been bugging me, so i'm starting to look into poppin the front end up that 2.5" to square out the look.

Everything i've seen so far, (minus serious mods like new crossmember), rely on re-clocking or cranking up the torsion bars. Anyone use these kits? Do they work well? Does the geometry change much? Tire scrub???

HELP!!!! Please, can somebody point me in the right direction.

Thanks
Nailm