I wrote this article about setting a vortec distributor and thought it might be useful for y'all. I wrote it and coded the page on the tail end of a 14 hour graveyard shift, so let me know if you find something that needs correction, my brain starts to get fried at those hours.
http://www.gmtruckcentral.com/articles/distributor.html
http://www.gmtruckcentral.com/articles/distributor.html