One quick and cheap place is in the back of a Haynes manual for 240Z. You may want to take it to an office supply house and have it blown up to 140% on an 11x17 sheet then it is easier to follow. The schematics that are in the Haynes are directly out of the factory manual. Depending on the build date of your 71 you may need to use EITHER the early or late model diagrams. Have seen them both ways.