preventive maintenance?
It seems you've got a good start for the maintenance. I'd also suggest a fuel filter (as has been mentioned) and at the very least a new PCV valve if you're not going to change to a LS6 PCV setup.
You may also want to get a new A/C and serpentine belt. If you plan on putting an underdrive pulley on, that'd be a good time to do the belts (especially since you need to buy shorter belts).







