you dont have to pull the motor...
depending on where you want to go with the car, rockers can take you far as well. plenty have ran 12's with rockers and stock cam. there are plenty of members on here that would gladly install a cam for you though...talk to miller (if he's feeling better), nitrous, and there are others. including wbs and zzp as well. i chose to go to zzp for mine for the sole reason i trusted them. now i also trust wbs as well.
IMHO i would keep the rockers and go with an ic for now. with your mods, if you added a PT and a full sized ic (wbs or zzp), id say you could run low 13's fairly easily, and possible high 12's with a 3.0 (with race gas if needed to kill KR) and DR's or slicks. but honestly, the cam is my favorite mod. sounds killer, and the xp pulls hard the whole powerband. a buddy of mine has the vs, and ill admit, he seems to pull a tad harder from 15-40, but the xp pwns the vs for sure.
dont forget, you'll need 105 springs and modd'd retainers as well with the cam.