You should call Chevrolet for the scoop on your truck from the folks who built it. It's easy! It's free! They'll send you a complete package tailored for your year of truck containing copies of the original technical data sheets related to your truck. The information is invaluable if you are trying to interpret serial numbers, determine what standard equipment and colors were, what options were available, etc. They will also send a catalog called 'Past Model Information' that has a listing of hundreds of dealers of parts for old Chevy's.
To request a free restoration Package from Chevrolet, have your Vehicle Identification Number and model year.
Phone -- 1-800-222-1020 Ask for the "Restoration Package"
Or write to:
Chevrolet Customer Assistance Center
Chevrolet Motor Division, General Motors Corporation
P. O. Box 7047
Troy, Michigan 48007-7047