The overflow sits just in front of the radiator support frame and over by the radiator cap area. Should be some bolt locations over there iirc.
Did the oil look good? No sign of milkiness or other gross contamination on the dipstick?
Check your turbo for shaft play, radial and axial. If there's just a little radial play (side-to-side) you're okay. If you've got radial and axial (in-out shaft play) or just a lot of radial play it'll need to be rebuilt or replaced.
The valve cover gaskets tend to leak as you already found. Check the plug valley too, as the #3 gasket there can leak as well and leave oil in the plug wells. None of that is a really big deal.
That fan with the tag on it that says 87 without turbo is a n/a fan, not a turbo fan. (I know, duh), but if you're going to drive it you'll want to replace it with a fan (and fan clutch) off a turbo car. That one shouldn't have been there at all on a turbo engine.
When (if) you hear it run listen close for any signs of rod knock. If he's run it with low oil the bottom end could be bad. Drive it, make sure you take it up to 2k-3k rpms as sometimes they don't knock till you're in that rpm range.
If you've got white-ish smoke it's a sign of water in the cylinders. Bad news. Grey-ish is oil being burned, could be from bad turbo seals, bad valve seals, bad rings. Black would be from running rich.
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