Wonderful looking crank. That's a really nice groupset - did you find it on eBay?

I knew I wanted a certain look, and while I could have got the Nitto bars in a clamp width typical for old quill stems (which is what these threaded headsets take), I decided to try the adapter and use a more modern stem, especially since the frame tubing is wide enough to match the new stem and not look weird. I did run into some spacing issues - I couldn't add another spacer on the headset itself as it left hardly any threads on the fork exposed, so that's why the spacer ended up on top of the adapter. The barrel of the adapter is just a tad taller than the clamping area of the Ritchey stem, and it looks really bad leaving any gaps. So I moved it as far down as possible, and the black space fit just perfect on top.
I was concerned about how the transition from the top nut on the threaded headset to the modern stem would look since they aren't necessarily the same shape or diameter, and thankfully after it was all spaced properly, it turned out not looking too bad.