Do you have the size nailed down? The older era of high end bikes are nothing to do with small, med. and large compact jam it to you dealer in stock.
If this is to your size, I'd go all chips in-
Zunow Z1 frameset
https://www.ebay.com/itm/Zunow-Z-1-5...YAAOSwICpZ7VCh
Proprietary Zunow tubes made by Tange. Trited (triple butted). TT is called Ditchex (note the cable gutter). The seat tube transitions from round at the top to oval at the BB shell. Pentagla chainstays. Cast lugs are a work of art. Dropous on this one are Campy, but they also used Columbus. Check out the details / brake bridge, fork crown, tangs, bridging on that awesome bottom bracket. This particular frame looks from the original shop in Osaka.