If the new engine has 180K on it, I would remove the oil pan and replace the pick up O rings. Much easier with the engine out of the car.
PCV easier to refresh when out of the car. Make sure you clean out the PTC nipple on the intake, assuming it is a turbo.
The rings and bearings should be just fine. They normally last forever.
If the head comes off, replace the valve guides. They start to wear at around 200K or so. 20 of those little buggars!
If the engine is separate from the tranny, replace the RMS.
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Keeping it running is better than buying new
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