I just started disassembling the quadrajet that came on my 85. I was hoping to find the reason that it was running so rich that it would foul out a set of plugs in a week. Well, nothing too obvious yet... but I am hoping that if I pay attention to detail that I can succesfully rebuild it and get much better mileage than the 12mpg my holley gets. I have been following a manual I bought, but stumbled on this site a little while ago. It has some pretty good links for quadrajet information- so if anyone is trying to learn about these then you may want to browse around here
http://www.florida4x4.com/tech/quadrajet/index.php