Cal,
Sorry I'm late to this thread ... and thanks for stopping by Stovebolt.com -- we hope to be the friendliest info source, if not the oldest and most complete overall. I'll admit our GMC info isn't what our Chevy info is, but we have lots of knowledgeable folks here who will be able to help you with just about anything.
Just as Bill said, we have a lot of good info in the various sections of the site, plus lots of images/stories in the Gallery.
There are lots of parts available for these trucks -- especially mechanical, interior and what not. NOS and sheet metal is more of a challenge, though. Be sure to check out our links section -- the most comprehensive you'll find online.
Again, thanks for stopping by -- we hope you've found a home here!
Regards,
John