Looks very nice (and a cracking example!) - I guess as close to "period correct" as you're going to get with that format of shifter. Do they play OK with the existing number of speeds on the back end? I assume you just can't use all the indexed positions on the levers as you hit the limit screw on the RD..?
The pull ratio on the shifters is the same as if I had the DT shifters indexed, so no adjustment needed at all. The front is a bit more work as it uses micro-racheting to shift across the triple, but it's fine, just something to get used to.