I run Autolite XP (Iridium) plugs in my 95 SC, mainly because I don't want to change them as often. I do, however pull a couple of the "easy to get to"http://www.sccoa.com/forums/images/smilies/eek.gif
plugs every now and then just to make sure there's nothing goofy going on.
keep it really simple and cheap and run the copper Autolite 103's and be done with it.