Paul,
You have the master cylinder (brake)big one up top, master cylinder (clutch) small one up top, ABS lower.
The ABS sytem does not require ATE blue, but it would not hurt. Not sure I am to keen on mixing fluids though. It the ABS had DOT3, I would just refill it that way.
The clutch would be OK to use ATE BLue, but if you do not do a complete fluch, stick with what is in there, probably DOT3.
You really only need to update the main system with the ATE Blue.
Also, great advise from Andie Lin about the SS brake lines.
HTH,
LarryB