Good lord, that goes back ages...my father bought the car new and had the wing, mudflaps and Centerline clones put on right from the very beginning. I bought the car from him about 11 years ago, wanted to keep it in the family and all--and because I knew it was impeccably maintained. It had about 72K km on it when I bought it. I haven't done much since; upgraded the rear coil springs, bought new, wider real Centerlines, did maintenance stuff and some restoration...new F-body rad & T-stat, cleaned out the intercooler, repainted the headlight bezels, replaced a flaky Powermaster accumulator and gravity-bled the brakes, etc...documented in more detail here:
http://www.turbobuick.com/threads/coelacanths-86-gn.415173
Now it's time for some minor performance mods; my own custom 3.5" intake and LS1 MAF sensor, Axis box & chip by Eric, EGR removal...next up will probably be a new fuel pump & hotwire kit.