Fred, there's lots of info on the web. Some very basic info can be found here.
http://ultimategto.com/cgi-bin/statsexpl...dataplate+price
After you've read through some of that, click on the 1969 area at the bottom for more data on the 1969's.
Some good reference books are "The Original GTO" by Tom De Mauro:
http://www.amazon.com/Original-Ponti.../dp/0760309973
An oldie but a goody, "The GTO Restoration Guide" written by the late Paul Zazzarine. This isn't a resto guide as much as a parts and diagram listing.
http://www.amazon.com/Pontiac-Restor.../dp/0879389532
There have been many articles in High Performance Pontiac and Pontiac Enthusiast over the decades about identifying a 1969 Judge. Much of that information is now scattered over the web, in web forums, etc.
As far as documenting a real one, the first place to start is to send the VIN to Pontiac Historic Services (usually referred to as "PHS"
to see if it's a real Judge.
http://phs-online.com/
There are also many books on building Pontiac engines for the street and for the track, but it sounds like you're really looking for a restorers guide on the 69 Judge.
All 1969 Judges were either Ram Air III or Ram Air IV. Aside from the Judge decals and the rear wing, along with a Judge glove box emblem (and very early production versions did not have the glove box emblem), mechanically The Judge was a cosmetic package on a Ram Air III or Ram Air IV.
Since ALL Judges were Ram Air or Ram Air IV cars, when you see a Judge, you know it's a high-perf GTO. Colors also varied on the 1969 Judge. The first batch were called "pattern cars" and were all Carousel Red in order to gain exposure. After that run, any GTO color could be ordered on a Judge.