Ok guys. I've disassembled the Master Cylinder and cleaned it up with alcohol as specified. It looks REALLY pitted. So, I suppose best to replace it.
I plan to order a new, original MC, and assemble with new lines
I have also been reading posts about upgrading to a dual reservoir non boosted system. Of course, this is a modification that I will be trying to do here in Italy with no assistance. Worth it or not?