If you convert to the S10 Blazer Extreme DP caliper/steering knuckle/rotor/hub assy, they come with the ABS sensor built in(the speed sensor ring is built into the divorced hub). That way you get killer front brakes and it is a direct swap for any "G" body. I'm doing the conversion now to my 80" Cutlass Calais and will POST pix when complete. BTW, S10 warehouse has another set on ebay. I wont be using the ABS, but I wouldn't just cut off those sensor cables as they are worth some $. Even if you got all the connectors, sensors,computer etc etc from a newer donor vehicle, and assuming the will fit physically the whole PKG. will be engineered for that specific vehicle for weight, tire wheel size etc. I kind of looked into it already.
Any Documentation is hard to find and if you have to buy any OEM stuff it costs a fortune. I know it's off topic a little, but I converted to OEM GM Bendix Hydroboost off an 80's Regal. Aside from the Turbo Buicks that had the lame electric brakes, any of the "stinky" Diesels will have the Bendix brakes. Gives you lots more room for headers/tall VC's etc; you can run a RAD CAM and not worry about loss of vacuum. Also gives you a lot more "push" for the stock binders. Make sure you get everything from the pump to the brake pedal and pin, they are diff, but bolt up as factory.