Jcd

I have an 07 Gt Cal special with 30,000 on it. I have been modding it up lately with such things as CAI, Brenspeed 93 Tune, hurst short throw, and just two weeks ago I added kooks Lt. headers with high flow catted x pipe connected to 40 series flows. I love the way new cams sound and I hear they can add 20-30 Horsies but I'm a little afraid of them. Will they break my factory parts that haven't been upgraded, do I need to know anything in particular, do I buy springs also and stage 1 or stage 2???
Help please. Many differing opinions on this subject and I don't want to buy the wrong brand or Cam.
Ty
JD