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@si_mon628
The crown race (lowest part of the headset) will need to be seated on the fork so he's probably talking about that, which would make sense to do at the same time.
Narrow/wide chainrings are very good, but the old one will be fine assuming it's not too worn, and chain/chainring/cassette are all of a similar age.
Cables - reuse if they aren't rusty/corroded etc, outers and inners can both degrade over time. Otherwise it's not a big expense to replace with new.