NGK iridium plugs and real AC Delco wires at 100K miles.
Thats good for stock rides. If your modded then a copper based plug such as the autolite line will be better although you have to change them a bit more often (every 30k or so). Lightly modded cars should look at autolite 605'* or 104'*. (1 and 2 heat range cooler respectively).
I should have researched more , I thought 606 were cooler than stock and I just put them in a week ago, I only run a 180 thermo and a FWI no real mods.If I change to a smaller pulley guess Ill change plugs again.605