The cam is very easy, me and my father in law just did his over the weekend.

There are tons of cams out there, so pic one that will meet your needs now, not your future plans, buy your mods and install them before you get the cam, ie nos, charger, etc.
With NOS, you'll get in the 13's along with a cam, an 04 went 13.8 i belive with nos. So you should be there no problem.

good luck,

allen