We don't mean to be rude (maybe we do?) but a 9 second gtp it an extremely difficult goal to reach. I am willing to bet money that at this point and time you cannot fathom the amount of work it would take just to get into the mid 10's let along the 9's or 8's.
Intense racing, who's employees SPECIALIZE in 3800 series engines were only able to make a 10 sec turbo setup, (i think it may have hit high 9's.) The World Record for a 3800 engine is by ZZP, a mid 8 seconds (and i have never seen a vid for this one).
I am not saying your goal is impossible, i am saying if you plan on taking some part in the build then stick around here for a while and learn a thing or two about the internals of a 3800 engine.
With that said, step one, buy a tuner and learn how to use it or find someone who can tune. A stock gtp can drop up to .8 seconds in the 1/4 mile with a good tune (or so someone has claimed).