For your heads P/P will givemore flow, the polishing on the exhaust ports will make them more resistant to carbon build up. Here is a DIY walkthrough of it... http://www.sa-motorsports.com/diyport.aspx
I actually have a spare set of heads I'm working/messing around with. Something I do when I get bored.
High ratio rockers can be had with or without the roller tip. Without, they run about $250 a set, with roller tip about $400. I got mine from Intense Racing. Kit was $399, came with 1.9 roller rockers and new pushrods rocker bolts and pedestals. With 1.9 they recommend a little heavier springs at least 90#. As for the cam, what rear gears do you have? ZZperformance and intense have a variety of cams themselves, as well as other grinds from Comp Cams and such.