I have a 1SS also. Just put on a Stainless Works 3" system with offroad, straight through mufflers. Sounds great. Gonna make a few runs with the G-Tech tomorrow. The auto is fine. For the type of mods people like me may be doing it ends up being the better choice. Mike and Team Camaro up in Oshawa have been doing a spectacular job putting these cars together. You'll enjoy it.
If you are really worried about it, get a hold of Bowler transmission. They can make your auto respond like an animal...