There is a little concern but I doubt it. Changing the waterpump on this engine can be done in under an hour
Waterpump was changed about a couple years back at dealer, hopefully won't need it for a while. If it does, I would at least hope the bolts won't be seized in there since they aren't original.
Honestly if you have the radiator out and the pan dropped its only a couple of clamps and a few bolts from pulling the timing cover. Then you can inspect the timing chain, oil pump, and replace the seal on the bench. Just make sure not to roll the lip of the seal when putting the cover back on.
That doesn't sound like a bad idea. Does the power steering pump have to come off? Haynes manual says to unbolt and tie it aside. I'm curious why they say to drain the coolant, but don't mention removing the radiator for timing chain cover removal. Also, Haynes says that if timing chain breaks it could result in severe engine damage, but I thought the 3.3 was non-interference? Don't really trust the Haynes though, they seem to mess up on critical details. For example, their trailing arm procedure is impossible.
fyi, switching to synthetic on a high mile engine is generally a bad idea.
Is that why I'm losing oil from everywhere?
Although it has used oil for a while, just not so bad.
It sounds like you are loosing oil out of everywhere. Park the car on concrete and see where the spots develop. The big problem is the smoke out the tailpipe. Some smoke after sitting for a long time is normal. A lot of smoke needs to be delt with. You might want to look into a compression check and a coolant pressure test to check for bad piston rings and blown head gaskets.
The weird thing is that the car doesn't drip anything. There's no discoloration in my usual gravel parking spot, and I also park it on level concrete here and there to check fluid levels and just to see if anything drips, and leave it there for a day or so. It seems that oil is only lost while the engine is hot and running mostly, and of course it seems, through the valve stem seals while it sits. Although I could let it run on the concrete for a period of time and see what happens.
After it sat for about 19 hours, when I took off today there was no smoke to be seen.
Head gaskets were replaced several years back when one blew, which lead to overheating the engine at the time. I think that overheating of the valve stem seals has caught up to me.
As far as the compression, if I had any problems there, wouldn't the gas mileage be pretty bad? Surprisingly enough the car gets really good gas mileage I think. The OTIS reads 26.2 mpg and some calculation based on miles and fill-ups gives about 24 mpg. Of course that is mostly highway.