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That smoke is oil, no doubt about it. The only doubt is, where is the oil coming from?
You can try a 'wet' compression test (squirt a bit of oil into the cylinder and test again - if it goes up, that suggests rings. The oil seals the rings to the walls, so if they aren't already sealing they certainly will when oiled.) Your compression numbers are not bad. And like others have said, the valve guides are the likely culprit for this kind of smoke.
This type of smoking is not uncommon and an engine can run a very long time with oil seeping past the rings or valve guides, so if you can't fix it now, fix it later.
If you've ascertained that oil and water are mixing, and all you can do is the head gasket and the valve guide seals, do that. BUT: Know going in that there is an outside chance that the head has been cracked by overheating. It does happen. And it would explain a sudden onset of all these symptoms. Get a magnaflux kit and read the instructions, or have the head checked by someone who knows what they're doing. If downtime is an issue, you might want to have a plan for what to do if the head turns out to be cracked. If you have a friend who's got Volvo heads lying around his garage randomly, now is a good time to go have a beer with him. In fact, take him bowling. Not that I think your head's cracked, but it's a good idea to brace yourself for that possibility rather than be blindsided by it.
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