Some good reference books are "How to rebuild Big Block Ford engines" by Steve Christ and " High Performance Ford engine parts interchange" by George Reid. Your local bookstore or Ebay sells them. About $20 each. These go into detail and explain the workings of the Ford FE engines, rebuilding and component ID. I like to keep these handy besides my master catalogs for quick parts ID. However there are a few typo's in each but for the most part good solid info. G.