
more for EFI guys....but still a great book regardless
Amazon.com: Ford Fuel Injection & Electronic Engine Control: How to Understand, Service, and Modify : All EEC-IV Systems on Ford, Lincoln, Mercury Cars and Light Trucks 1988-1993 (9780837603018): Charles O. Probst: Books
and this one, which is like a 5.0 bible

Amazon.com: The Official Ford Mustang 5.0: Technical Reference & Performance Handbook : 1979 Through 1993 (9780837602103): Al Kirschenbaum: Books