FWIW, when I did my cam install...IF you do; do everything at once. I went with the Comp Cams XP Cam, got the #105's and retainers. Had it installed curtousey of Green Bastard Products.

In the long run, it all depends on how far you are gonna mod. If you don't want to really "break" into the motor...I say rockers and headers...that'll be pretty quick too IMO