With a 8 coil Ign system there is no need for fancy high priced plug wires so save your money and use stock wires.
If using headers slip koolsocks on them to prevent header heat damage.

You may find with your mods that going 1 step colder plug like a NGK TR6 with a 0.40 gap is better then stock ones at 0.50/60 gap.

All intakes starting with 2001 model year used the same intake manifold as the LS6 so if car is 97-00 then its fine to swap to newer intake and I'd leave the cooling/air bleed lines installed that go from one side of engine to the other.