A UN54 bottom bracket is also what I put in my Koga Pro Am with the same New600 cranks a while ago. Just for convenience. I believe this set is the 1st that uses the same taper as modern BBs. Earlier Dura-Ace 1stgen/EX/AX were all slightly different.
Shimano 600 shifters. I think i may still go with the Exage ones to begin with as the hoods on these are a bit brittle and impact the lever action slightly. From what I have read there isn't any good fitting new substitutes though?
Donor rear derailleur. A bit scratched up, but seems to be in good working condition. Give that Shimano 600 seems to be printed on and not engraved, polishing this may not be an option.