As Brian & Greg suggest...
The GM Service and Overhaul manuals are the best,
the assembly manuals are also a must....
I also found some info in this book..'How To Restore And Modify Your Corvette'..from Motorbooks International.
It had some non-stock hints.
There is also a a 'Vette Views Fact Book' for the C3's that has lots of factory stock restoration details.
You can't have too much information..