I trapped a few 105-106 mph runs on a stock '03 transmission...mods I had at the time were...XP Cam, Pacesetter Headers, stock tb with fully ported blower (I know...prolly could have gone a little faster with the TB but my LS1 swap was in the works), tune, 3.4", and other small crap like an open cone, 160*, AL103's, MSD coils/wires (not that they helped), poly mounts/solid lowers...its all about the driver mod though.
If I were you...I'd do...
Open Cone, port your blower and TB, ZZP Stage 2 IC or any big IC that might be for sale somewhere on teh cheap, 42.5lb. injectors, headers of your choice, hell...even 1.84 roller rockers...you should be able to get away with a 2.8" or so on there with a good tune and just pump crap 91...and probably a 2.6" at the track with a little race gas. That should be good for mid to low 12's if you can drive it and it hooks...trap PROBABLY around 108+
