I did this quite a while ago but I don't post on CO often anymore because there's too much BS, but I thought I would share. I did this modification because I race my car, and felt it was worth it. I wouldn't recommend every DeVille owner go out and do this.
Most of the parts for the conversion. I reused NO OEM brake lines, completely custom.
The ABS module shortly before I ripped it out.
The ABS module and a bunch of old lines shortly after I ripped them out.
SBS Pro-Touring pads on the calipers. I highly, HIGHLY recommend these pads.
JEG's adjustable proportioning valve, used to adjust the front/rear bias of the brakes manually. Mounted in the trunk.
(If you aren't aware of how to set your brakes up, please do not try to install one of these)
The Bendix shoes ended up being the wrong part, so they were taken back and better shoes were purchased in their place. All in all, for a new master cylinder, new lines, fittings, pads, shoes, drum hardware, hoses, rotors, the prop valve, and tools to put it all in, I spent about $500, and then spent 4 days putting it all in.