With stock cams, what's the point of having a 9100 redline? You're not making power up there. Just increasing wear and tear and setting yourself up for potential vavle train failure if your zinging your stock ITR valve train to 9100 rpms daily.

Why trade out your ITR crank for an LS crank? ITR is balanced for high rpms so it should be plenty for whatever you want to do. Also the stroke of the LS is longer so won't be a simple plug and play. The LS crank has slightly longer stoke so you may have clearance issues...also you'll have a crappier R/S ratio so you'll end up decreasing you maximum potential for rpms.