The AIM(Assembly Instruction Manual) is invaluable when determining where this or that part goes, how it should fit, what it is called, and what the part number for it is(was). This is the actual "instruction" manual that told the original assembly line folks how to build the cars at the factory. I think every Corvette owner should have this, if they plan on doing any work at all to the car.
The Factory Service Manuals("Shop" manuals) are just what they sound like...the manuals used at the dealerships to repair the cars. Some years have more than one manual. One might only cover chassis/body stuff, and one might only cover overhaul of major components such as engines/trans/diffs, etc.
This is another invaluable "tool" every Corvette owner should have, imho.
The Haynes/Chilton/Mitchell manuals usually cover several year models, and the info is not always very specific, or detailed...it's more general. These are ok for basic stuff like tune-up info and such, but the Factory Service Manuals are always a better deal, as far as specific info.
"Restoration Guides", or the ones I have at least, are more tailored to a specific car, but they do have some good stuff on bodywork and chassis mods...They do have their place in your library.
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Joel Adams
C3VR Lifetime Member #56 
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"