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@deleted
From my experience, is better to check before reaming, or leaving things as they are. This applies to traditional or integrated headsets.
Some old frames (the older, the bigger, the more likely is) have actually stretched head tubes, so the h/set cups will go in by hand. Not very good, needs Loctite 641 or Araldite.
Few new frames come already prep'd, facing is usually good, even integrated h/sets may benefit from a h/tube reaming, I saw more than once paint, o corrosion treatment that wouldn't make the bearing sit properly. For internal h/sets usually a quick job with fine sandpaper -trying to be as even as possible- solves the problem