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@Jon.
Cable pull is dictated by the shifter, provided this matches your cassette spacing there shouldn't be too many problems. If you get a modern 7-speed freewheel you can use either a 7 or 8 speed shifter - the spacing is the same.
I'd avoid Shadow as it uses a longer cable pull, stick with a 9-speed chain and derailleur. Chances are it won't be as smooth as a matching drivetrain but should work fine. At the worst you could put in longer limit screws, but you probably won't have to. You'll most likely need a long-cage derailleur with that cassette if you're planning on anything but a single ring setup too.