Use the smaller diameter stove pipe. It helps to protect the composite intake from the heat from the EGR stovepipe by allowing for an extra gap.
If your cap for the PCV didn't have a sensor in it, and was solid, use that one instead of the one that came with the Dorman kit.
What you can't see can hurt you. If you've had an UIM failure, the odds are very good that you have coolant in your oil. With the coolant/water being heavier than the oil, your lower bearings are sitting right in it. Don't want to spend the few extra bucks for an oil change, that'* your choice. Don't be surprised if a few months down the road you turn a bearing.
Black 2000 SSEi, Silverstar Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, drilled 180 degree thermostat, Intense FWI, PCM, shift kit, and 3.4 Pulley. Solid front mount.