I don't want to tell you what to do, it's your ride man.
My $.02 is that if it's already there and you're swapping the chassis, why not leave it? The only plumbing you'll have to do is from the master cylinder to the ABS module.
They actually only have 2 sensors on the front wheels and get the signal for the rear from the transmission.
So, here's an article on an ABS swap ito a 1st gen Camaro.
http://www.hotrod.com/techarticles/h...ods/page2.html
Here's another link on ABS, not the one I wanted to send. My PDF won't go through. It' for a 97, believe it or not the ABS really hasn't changed since then. The control module just got smaller and faster.
http://www.truckforum.org/forums/gmc...bs-wiring.html