Just Jumped Into a Project

My son asked me to purchase my neighbors 1977 Buick Lesabre (13,000 Miles) for his first car. Hasn't been started for a couple of years, but I know enough to get it running. I can do the basic tune up, change standard parts, and maintenance stuff (and he'll have to do it with me), but if anyone can give me info on some things that are common issues to look for, it would be appreciated, especially electrical. 3.8L V6. He gets his permit next week, so I have a year to get it to a point where he is on his own driving it.

Any tips would be appreciated.