Before buying a car, it is a good idea to get some background info on the particular car. Also, it is a good idea to visit/join a local Buick club in your area to meet fellow owners of the car you are interested in. They will be able to tell you particular problems associated with the car as well as what to look for when reviewing a car. They may also know of a car for sale that is not officially for sale or in the local Auto Trader or newspaper!
Below is a list of Buick publications available.
Classic Motorbooks PO Box 1 Osceola, WI 54020 1-800-826-6600 FREE Catalog They carry the Buick Buyer's Guide for $17, Buick Riviera 1963-73 Photofacts for $15, Buick Musclecars 1965-70 for $17, Standard Catalog of Buick 1903-1990 for $19, Buick Gran Sports, A Source Book for $13. Wide selection of books on motorcycles, racing, resto, street rods, trucks and equipment. American Publications 1928 Sherwood Forest Houston, TX 77043 713-973-1008 They sell strictly Buick books such as: The GS Facts and Figures Book I and II,Guide to GNs, T-type and GNX, Guide to Buick Engines.
Another good idea is to attend some swap meets to purchase a Chassis Assembly Manual for your particular year car. They are about 3.5" thick and cover everything about the Buick models for that year.