12's on motor with the 5.3 ain't gonna happen without slicks...period.
Even then, its gonna be close. If you run 12's on motor, you really have your shit together with a 5.3. You prolly have the gears and converter to get really close with the tr224. But again, its gonna take sticky tire. Your truck may run mid 12's now if you had a sticky tire. What was your 60' time with the 20s?
Yes, NOS, Nitrous Outlet, and Harris Speedworks all make a plate that will fit your stock truck intake.
You should come to Thunder Valley friday night. I'd like to take a look at your truck.

