I'm glad you are using 2010 Camaro driver side manifold . I've looked at them when they first came out and woundering if they will work , at least driver side . I know JTR headers will not work , on driver side . You don't have to do anything to trans tunnel to fit a T56 ( it's tight ) . LOL .
With stock 5.3 , the 5-speed should be fine . The half shafts are your weak links ( ask Matt , he broke 3 u-joints ) . You might want to upgrade to turbo CV axles . It didn't take long for me to clunk my rear diff . I'm going to put a solid axle in my ZXT soon , 8.8 GT diff. and a 6.0 turbo is in the plan for it too . Already have the LQ4 block , LS3 heads and intake , 76mm turbo , 102mm TB . Will be sometime next year before I start on it . Too many projects and so little time . LOL