Thanks I will try slotting and much more PB blaster with heat.
The front brakes are good now - just a lot of bleeding to get them going. I had to clean the rust off the plugs to get a wrench on them.
See photos; (I think this link should work maybe copy and paste if needed)
I am curious about what you plan to do with that Carb Piston Slide? Do you plan to reduce the scouring by polishing to try to reduce its rough surface? Or - replace with a spare? Or - just throw it back into service without dressing it?