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Actually, some of the 70's GM manuals had some very good information. ...[They had] detailed explanations about how components operate, like: air conditioning, differential operation, carburetor operation, etc. By 1979, a lot of the theory and operational basics had been taken out of the service manual.
I'm going to check the local community colleges for classes. Also going to ask my neighbor (he's a mechanic and has a full shop with lift, welder, etc) if he'd be willing to teach me some stuff.