I know the European ZX14 has Anti-Lock breaks. What do I do to upgrade my US model. At minimum, I want the rear to be anti-lock in emergencies.

Gotta have front and rear as it is a complete loop. So if the rear drops out, it might shut down and you are bone stock again.

If you pieced out the parts, she will run in the 1000's. Wait for a new bike with ABS. You've been without for this long. You'll be wasting money toward the better bike down the road... Unless you gots the money then go piece it together.