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@Emyr
Some chains come with joining links, so you aim to have an "inner" link at both loose ends so the joiner pokes through both holes (ooh er).
I like chains which use joiners like this one:
You should be able to measure the chainline with a ruler, for a track frame it'll be 60 minus the distance from the inside face of the dropout to the middle of the sprocket. Probably 45ish.