[RedCoupe]

There is much information about engine rebuilding fundamentals available. But, first I would make sure that you and your son have a solid understanding of internal combustion engine theory and design. The basics of the four stroke engine. Then on to different engine configurations: six vs V8 vs boxer 6, etc. Single overhead cam vs double overhead cam vs overhead valve vs flathead. Two valves per cylinder vs four or more. Air cooling vs liquid cooling. Once you have a good understanding of how engines work, then proceed to study about the fundamentals of engine overhauling and rebuilding. You actually might want to disassemble a small engine or two before jumping into a rebuild of a car engine. There are are certain "best practices" that one does with every engine that is worked on, while there are other procedures that are specific to the application. Factory workshop manuals are good places for the specific information, procedures and special tools for certain engines, while textbooks and general training manuals show the basic procedures and practices. I don't believe that there is one source. Learning is a continual thing. I did my first complete engine overhaul 46 years ago, and I'm still reading and learning!