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As for what work to do, that's kind of up to you. I've done it both ways, and in general, have seen little difference. If you're not experiencing issues now, they'll probably go another 180k.
As for the chain, if the motor has never been apart, it would be a good idea to install a new chain. This is more in the line of preventive maintenance (preventing you having to do it later...) than anything else. I have a 1990 900 with over 300k on the clock, and the motor has never been apart, and I don't have any problems.
As for pulling the head, you will need a particular size E-Torx socket. I think it is E-16, but I'm not 100% sure. Note that the one that Saab sold (when they still sold their own tools) is a 1/2" drive impact-style socket, sourced from Germany. From what I hear, most E-16 sockets that you can buy in the USA are 3/8 drive. I'm sure with some digging you can find the 1/2 drive (you really need it).
One thing to watch out for: Be very careful re-tightening the cam sprockets on the camshafts. A friend was rebuilding a motor for me, and the "key" sheared off the sprocket, causing the cam to stop cold, and bending a few valves. Fortunately, that was the extent of the damage, and the head ran fine after that.
There are many things you can do under the hood during this "down time". You can spend an awful lot of money, but you'd have an essentially new car under the hood. When I did this the last few times (it has been a long time), I would have the motor out (usually because of some transmission issue) of the car. Just on principle, I would change the chain, sprockets, water pump, crank seals, spark plugs & wires, filters, belts, upper control arm bushings, re-grease the inner drivers, clean out the engine bay, change motor mounts, re-do the clutch, lots and lots of possiblities.
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