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Sucks that the Nitto M106 did not fit the 7400 quil stem, but the classic bars might actually fit the frame better.
This is beautiful! You might have thought of this already, but did you consider matching the M106 bars with the Nitto Dynamic stem? I used this to replace my old Cinelli set-up and much prefer the bar shape. (I also still have the Dura Ace AX aero seat post on this, lovely except the graphics started wearing off about 20 years ago!)
I had the frame for years sitting unused in a corner with a full 600 tricolor group and some random other components. Build started when a 25mm DA7402 aero post popped up locally for cheaps about 2 years ago. But life got in the way, buying a house, having offspring, you know how it goes.
Quite happy how it turned out, the mix of Dura Ace 7400 parts and 9000 components where made for eachother. Sucks that the Nitto M106 did not fit the 7400 quil stem, but the classic bars might actually fit the frame better.