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@sdw
I've recently finished building a similar bike-
90's 531c frame with late 1999 campag mirage/veloce/ chorus 9 speed mix of components.
Bought an nos mirage group from hilary stone and 'upgraded' parts and sold the ones I had over time.
Dont really notice much difference between the cheaper parts except for the finish of them... Didn't notice any difference in performance between mirage and chorus/ record and most of the parts were the same weight! Maybe the more expensive parts will last longer?