[Batman]

If there is one thing I've learned from the LS1 is it needs more low end. It seems like most cars trap high and don't put down the E/T. I honestly don't think a true bolt on is going to go much more then 12.3 but I am already impressed with the 12.5 you already put down so you must have a stout engine (lucky bastard!). So anyway here is my advice for knocking out that 11:

-Weather- you want it somewhere in the 40's and low humidity. Too much colder and you will have trouble hooking up
-Lose at least 100#'s from the car
-Be prepared to sacrifice your clutch on a 5K launch and hang on for dear life if it gets squirrly
-And I think you will need to WOT shift

If you can get all that with the strength your engine seems to have I think you have a shot.