48bomb- If you do the 14 bolt swap, don't fret if you can't find a dually rearend. The oem hubs off of your Eaton rearend will fit a SRW 14 bolt. It'll give you a 65" WMS instead of 63", but still doable. You will have to ge creative with your drum brakes though. It's a good thing that GM makes a 7.8, 6.3, 5.1, and 4.5" thick drum. Some of the narrower drums may not work with dually rims though.
Pirate 4x4 has a ton of info here about 14 bolts-
http://www.pirate4x4.com/tech/billavista/14b_bible/index.html
