Yes there is a shop manual and a parts manual, often available on ebay. Also the book "The Last Onslaught On Detroit" lists all information to decode the body tags etc. The new book "Built to Better The Best" also has a lot of that information. There is a copy of each book currently for sale on ebay. Engine parts are available from Kanter Auto in NJ -
www.kanter.com and, there are a lot of vendors who sell parts and are very helpful with information.
Terry Zeug in CA is a good source -
zeugskfparts@roadrunner.com or Rudy's KF Parts in Ramona, CA at 1-760-789-3608
This board is also very helpful.
For me, when restoring a car, first thing I do is go through the engine, then the brakes so the car is mobile, then just start tackling the rest in order that best fits time and funds.
Good luck!