The books you want to buy from NCRS are:  1994-1996 Corvette Technical Information Manual and Judging Guide and 1953-1996 Corvette Judging Reference Manual.  When you join NCRS national, the local chapter gets your name & address.  When they rec'd our information, the officers of the group contacted us.  They were all very helpful in urging us to get involved and answered many questions.  What's nice is that you don't compete against other cars.  You compete against yourself where you start off with so many points and then points get deducted for items not original or for items that are not in new condition.  It is a lot of fun and a challenge.  The members advised us to do nothing to our car until we had it judged to see just how good it was.  They give you positive feedback to help you improve your car. 

Good eBay store...
http://stores.ebay.com/vettepros-usa
Since this warehouse is not that far from where we live (it is south of Charlotte) we were able to take our list of parts that we needed and visit the location.  Nice people to work with.  If you go in person, go with cash.