Those are getting somewhat rare as most people ripped the 6 out and stuffed in an 8, the stock ones are becoming collectibles these days.
I would change all the engine fluids, battery, starter may be fine. I wouldn't change out everything until you at least get the engine running. Nothing like replacing a lot of parts only to discover it has a rod knock or other internal issue.
Oil wise plain old 10W-30 non-synthetic is what it should use. Make sure you can turn the engine over by hand with a wrench before doing anything else. A locked up engine could be rusted internally from setting. Usually you can feel that because the engine won't turn or it will have areas where it turns real hard. If you can, get one of those cheap inspection cameras for a phone or laptop and look into the spark plug holes before hand. That can make it easier to go farther if the bores are all clean and bright.
Thursday, June 4th, 2020 AT 2:17 PM