I've eliminated the abs brakes on a couple projects with no ill effects. We have put over 60,000 miles on my 48 Plymouth coupe that I eliminated the ABS from. I ran the rear line directly to the rear hose and then replaced the hard lines across the axle to the wheel cylinders. Then I removed anything ABS related. That was with a 1990 harness, everything ABS was pretty much stand alone. I suspect when you get into the newer models, eliminating the system may still get you a dash light (that you can pull the bulb out of). I'm using a 96 Dakota donor with ABS on my current project. This one has the full on 4 wheel system, one would have to redo all the brake lines on this one. Its going to be a 4x4 used during the winter, I'm thinking I'm keeping this ABS system.
I can tell you that through those 60K miles, there were a few times I wished the ABS still worked, but for the most part, I haven't missed it. Gene