In order to get the Ford 100,000 replacement / service, be sure to use platinum plugs. Many experts and knowledgeable people I have asked for brand recommendations, and it's unanimously in favor of the manufacturers brand - Motorcraft in the case of Ford products. YMMV See "Related Questions" below for more
Accel makes shorty plugs that will work. Cross over a AC R44T to the Accel or if you drive a lot in town, cross a AC R45TS.
I have a 1990 Lumina Euro, 3.1 and there are 2 ways to change the plugs and wires. The first is what some mechanics do, by rotating the engine forward and blocking it that way while they change the plugs, which is the way they changed mine the other day. The other way, is the way I change them, which is to remove the alternator and then you can get to the back plugs fairly easily without having to go through the hassle of rotating the engine forward. I prefer this way myself and I usually chane my own plugs, but I had to have some other work done on mine so I let them change the plugs and wires since I need it worked on while I was working. The front plugs and wires are easy to get to. Use sparkplug pliers to get the wires off the plugs. Hope this helps.
Straight forward job but be careful on replacing the plugs as they are deep also remember which lead goes where
I would recommend checking your distributor or coil packs depending on what you have. Plug wires and plugs.