There are 2 cams on each lower control arm, for a total of 4. One is on the front, the other on the back, on each side.

I don't know alot about aftermarket control arms (camburgs, etc.), but I was considering purchasing some so that I could keep running my factory 5 stars and still have plenty of a-arm clearance with 285's. I talked to Steve at Sonoran Steel about it, and he advised against the camburgs and others because he said "they run maxed out" as far as alignment settings go (which seemed funny to me, because they are the upper arms, and even the factory upper arms don't have any adjustment), and that I could forget about ever getting it aligned again. I'm not sure what he meant by that, and it may have just been a sales thing to encourage me to get his shaved stock arms instead.... I just took his word for it and bought some wheels w/4" backspacing to get the clearance I needed. Maybe someone who has some will chime in.