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Not much more work to do the chain. Even if you don't really, really NEED it, it's $75 worth of peace of mind, which to me, is worth a lot.
On the cam oiler tube fittings, I think that they are only about $8 a side. But beware: as inexpensive as they are, proper reinstallation is critical. A person on this board had their mechanic not completely reinstall a set that the mechanic had removed (and I don't think they are designed to be re-installed), causing fairly bad cam bearing problems.
The new ones should "click" in (after removing any bits of the old ones). The click might take a little more than hand pressure, but a lot less than a hammer.
I would say that unless the engine has been abused from lack of oil changes or oil stavation, or has a really high # of miles, new gears would be an extravigance.
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