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@johnH20
Rebuilding 1990 ish Colnago with new Record headset. Upper and lower head tube cups ( races ) will not fit. They measure ( with mic )30.27mm, the head tube ID is 29.9 mm ( measured with vernier calipers so might be 30.0 max. ). According to Sheldon Brown dimension should be 30.2 nominal. I would expect approx 0.1 for interference fit so that would make sense with new headset. Head tube therefore seems undersized. Any classic rebuilders had this problem and what did you do?
PS. I have fitted headsets before and have the tools albeit homemade.