My advice is to get a technical manual, like Chilton's or Hayne's. Better yet, one from GM themselves.
The out of print GM shop manuals are expensive as hell. A reprint of a 1989 Camaro shop manual is $146, owner's manual is $10.
http://www.gmgoodwrench.com/TipsAdvi...ceManuals.html
Although, if I wanted to find one used, the first place I'd look is Hemming's Motor News - " the bible of the auto enthusiest hobby".