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You didn't mention it, but the coolant reservoir tank would be a definite replacement item while you have the engine out, if you don't have evidence of it being replaced recently. There are no valve cover gaskets, it's just sealant, and for the camshaft removal there is a special tool set for that, so if you plan on doing the guides you will need that tool, or make one. Also I would change the two chains at the same time, again, while you are in there. You mentioned doing tensioners, that is a good idea, I have not seen anyone really recommend replacing the oil scavenging pumps in the heads, but new o-rings would be good. That goes for anything you take off, of course. A relatively cheap thing is the oil pump release valve and spring, use the upgraded 996 one, there are threads here on that. Could also do the oil pump drive key, again, there are threads on here about that. Also didn't mention the thermostat, although I would assume that was changed when the coolant pump was changed.
I can't think of anything else off the top of my head that you haven't already mentioned.
Good luck!
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