AC Delco plugs. Regular, platinum, or double plats if you can afford them. Don't do the cap and rotor unless there is something wrong with the opti already.
Best caps are the brass post ones, but GM used alum and they do survive. I like to take mine out and clean up periodically and replace the Opti seals while I am there.
I would look at the NGK Iridium plus, look for a set of TR5IX's, they are OEM on my 2000 Park Ave Ultra and survive well in supercharged applications. They are OEM under AC Delco part number 41-101 and will work great in the LT1.
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