NOTIME383

I'm fairly new to LSX engine but not new to engines in general. I just purchased a 01 Z28 and want to ask some questions to make sure I'm headed in the right direction.

1: My 01 is already equipped with a LS6 intake?
2: There are no real ignition upgrades except maybe MSD wires?
3: TR55 are the recommended plugs on a NA tune-up?
4: The rattling ( piston slap, piston pin, bearing) during cold running between 2-2500rpm is normal?
5: What's a good clutch that will handle future head/cam upgrades?
6: Best air box? Exhuast system?
Thanks for your time, looking foward to the replies!