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$21 shipped.
BTW, totally killed my radio problem, just like Bill C said it would. Gaps of all new plugs were .045 inches. In accordance with GM'S notice to people who buy them, I did not attempt to adjust the gaps to 0.40".
Some wire kits are sold with the metal shields... the shields make it very easy to pull wires without damaging them. I use both the metal shields and a cloth heat shield which keeps the wires very well protected.
For a close to dead stock engine as noted by Bill and others above just go with the AcDelco stock replacement Iridium spark plugs.
Now as a side note only and not to confuse the OP, for my warmed over LS6 based engine in my '99 FRC with 410 rwhp, I am running the one (1) heat range colder than stock NGK TR6ix Iridium plugs.
I was told, because of the mods to my engine, that I should go to a colder heat range plug. Been searching for AC Delco heat range information but can't seem to find it. Anyone have a link to a source?