I switched to the 3.27 years ago, if I had to do it over I would have gone with the 3.45 because I ended up going heads/cam etc but I do like the upgrade overall. You are correct 10-15 Camaro auto. Pat G is also a good option for a mail order tune, call a few and pick whomever you are most comfortable with.
I didn't replace any of the bushings and did not get an alignment. It was pretty straight forward from what I remember, I think it only took a few hours in the garage.
Good luck with the swap.
2009 MSM Sport/Premium, Kooks 1 7/8 Mids, Solo Mach Unbalanced, ,Vararam w/HSRK, RCR Drag Sportsman cam, ported heads/intake/TB, Yank SS3200, Pat G tune, 3.27, Elite Engineering catch can, UDP