Everything You Wanted to Know About the PI 4.6L Headswap (well, almost) is the new link for the old EP hosted site that meatball posted.
The site has a parts list as well as common issues found when doing the swap.
As for the cams, I'd suggest tuning the car to get the most of out it. You don't have to tune it, but it will complete the package and you can't really say you did it right unless you've tuned it. I left a lot of power on the table with my headswap tune and I was using box stock parts.
I don't recommend using DIY tuners and things of that nature. I'd suggest taking it to a professional tuner with a dyno and wideband A/F monitoring capabilities. Without the dyno and the A/F ratios at hand, you're simply guessing.