nice looking truck! Welcome to the site. Be sure to stop by the welcome forum and introduce yourself and your truck! ONce you have 5 posts, you should be able to send and receiver Personal messages (PMs) and view all of the forums.
Also, a lot of the technical questions can be asked in a specific forum for the best answers (engine forum, interior, body/paint, etc)
21RW-A 1230 21 = Janesville, CA assembly plant (actually in Wisc, as corrected/noted in a post below - thanks) RW = 6400 -A = ? 1230 = 1230-1000 = 230th 6400 out of that plant that model year
Fitzy, welcome to the Stovebolt. That is a nice truck. It is a real piece of history. That dash sticker is really special. I think a great journey for you has begun!