Choosing an intake is fairly straightforward; choosing a cam is more involved.
Unless you're seeking max horsepower at high RPM, you want a dual-plane high-profile intake like the Performer RPM - period. The only reason to vary from this is hood clearance.
Cam choice starts with knowing a few key pieces of information: head flow and where in the RPM range you want to make power.
Flow tells you what lift range you should be looking at - there's no reason to lift higher than what the heads will flow...this just leads to a dog as you end up with longer effective duration which leads to loss of intake velocity at higher RPM. So you look at the flow numbers for the head, and where they level out is the "sweet spot" for lift.
The ICL, duration, etc. are all more about where in the RPM range you want to make power - the important thing is to know this. There's nothing worse than a cam set up to make max power at 6,000 RPM...in a truck with 2.73 and a TH350.
I should write a cam selection FAQ...but it would probably never get sticky'd
