Where can i get these books?
Available used on ePay, etc:
http://www.ebay.com/itm/like/400795658058?lpid=82The only problem with the original AC Delco references (now obsolete to the best of my knowledge) is that they were updated on an annual subscription basis. If the subscriber allowed his/her subscription to lapse one time, updates would cease. So, "used books" may be incomplete due to subscription lapse, or crucial loose leaf pages may be missing.
As to the quality and completeness of the reference material, it was great. You could find part numbers for virtually every individual component. And, the individual parts were actually available! Books were published for carburetors & TBI, electrical assemblies, and brakes.