I love the ls3 - one of the best engines ever designed and put into production in my opinion... As we discussed before there should be no reason why you wouldn't be in the low to mid 900's with your setup. Only thing you really have to worry about are your iat's churning the blower that much. I know on a nearly identical setup on 109 fuel and 15psi you can make almost exactly 900 or a touch over to the tires or at least that's what I typically make with it... Heck even on 93 you should easily put down 850ish...
Problem I've found with all the ls motors is that the rotating assembly with a good tune can take anywhere from the 800's to 900's to the tires no problem and be beat to death and live a long healthy life at those levels, but after that due to the limits of the block your better off going to a completely built engine and selling your entire motor as an assembly to someone needing one or set it aside for going back stockish or whatever later... That is if you don't send your motor off somewhere very repeatable and have the cylinders and block as a whole upgraded and strengthened... After market iron blocks or already built and beefed up aluminum blocks aren't that expensive and will rather easily handle that next 500 or so hp additional level to the tires... Worse case scenario is you try to have your stock aluminum block machined by a not so good machine shop like we did and wind up with a built motor not handling as much as a stock motor can and you wind up throwing away several thousand dollars to go the way you should have gone in the first place... We had one we thought was lifting the heads, but even on 12 psi with a magnuson supercharger "which is as low as we could turn the boost down to on our setup" and timing pulled back to where it was only putting down 750 to the tires on E60 - it was still puking coolant out around the extra head studs we opted to be added to our block externally... Pulled the heads only to find machining marks embedded in the head gaskets which also so happened to coincide with the way the exhaust traces on the block and heads were flowing and leaking out of the combustion chambers... Straight edge also revealed how untrue the block and heads were machined... SO different shop, unfortunately lots more mulla, problem solved...
Long story short - if you do choose to build your motor - only use one of the good big name places or your own machine shop if your fortunate enough to have one
There are also others on here who have regularly pushed the ls3's into the 900's to the tires without issues besides me, so I know they'll take it just fine with the right tune...