Thanks for your insight guys. I guess I'll stop worrying about mileage and just focus on making sure everything works. After all, when you think about it, 160,000K isn't very high for a 32yr old car.
Have had a pile of flare nut wrenches, mostly Craftsman, for years. Never broke one. Next step is ViceGrips.
BTW if working on GM calipers, you also need an 18mm. Ratchet is best.