What carb and intake for 5.9 Magnum?

There is a dead link in your post.

There is one problem to different head choices for a Magnum block, "LA" heads can not be used unless you drill an oil passage through the block or set up oil through push rods to work right, IIRC.

Cam choices are like socks in my draw, constantly changed out, for fun of course. But knowing what your going to install first is a plus.

CARB CHOICE being 750 cfm is a good all around choice for a mild to somewhat decently wild 360. Carter or Edelbrock, the choice is yours. Though, if the cam gets a bit beyond 236* of duration (At 050) I like the Holley a bit batter. And a good decent unit, not just a simple replacement unit.