Nathan, the 300 runs 1.6:1 rockers from the factory, and, it's a flat tappet cam, not a roller. As for computers, well, the best way to go is aftermarket, the computers for the 300 are either speed density or OBD-II MAF, and, nobody really does anything for 'em...
As for cams, well, if you wanna go really wild, Schneider makes a 320M....
I suggest you check out
www.fordsix.com Evan