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...BTW, if the spindle length is 118 (which is easily measured), as you said, there are triples that will fit on there. And the bolt center diameter is the Shimano standard of 130 for the two larger rings, so those are easily changed to whatever your poor, beat up old legs can handle, I was just looking at one yesterday, thinking I might use it to build up an older Torelli frame (that actually was made in Italy, but with standard threading in the BB). The good thing about using Shimano is that you can get decent indexing stuff for frames made back in the 6/7 speed era.
Indexed shifting that works well is a delight to use.