That '74 GC has what appear to me cranks off an close to same time Ital-Vega superlight.
Personally, scary. But if you want to recreate that bike from a frame, there you go.
I have purchased some "period" or at least period looking drillium parts here and there for effect. Thankfully they went cheap.
I have a few "factory" drillium chainrings, if I were to need to sell those I would expect a premium. Everything can be replicated, but at what cost?