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Turbo or non-turbo? If it's a non-turbo you should have a bit of an easier time getting some wiggle room with the exhaust manifold. If it's a turbo, you also have to remove some $$$$ studs to move the exhaust manifold. I found it impossible to put new exhaust manifold gaskets on with the head in place and the manifold all bolted up. I'd say give about an hour plus parts (you want to replace the 8 lock nuts as well, and possibly the studs). Worst case something breaks off or gets stripped and you've got to repair it. If that happens (somewhat likely that you'll break or stuff up a stud) it can probably be repaired head-in-place (which shouldn't cost too much). If something really goes wrong, you'd have to pull the head (which could theoretically add 4+ hours of labor).
Spark plugs are cheap and easy, should only take ten to fifteen minutes to do. Expect a shop to charge you for more than that tho, maybe half an hour. Worst case you strip the spark plug thread and need a heli-coil or something (again, this can probably be done head-in-place).
As for labor rates, I'll take a wild ass guess and say $60-$100 is an acceptable rate, depending on the cost of living for your area.
I'd say spray the spark plugs liberally with a decent penetrating lube (like P'Blaster) whether or not you change them yourself. Ideally you'd go out and buy a torque wrench ($20 - Craftsman beam type 5-65lb-ft or so, 3/8" drive), 3/8" drive ratchet ($12), appropriate spark plug socket ($6 - Craftsman 3/8" drive u-jointed socket), the spark plugs ($2/ea - NGK BPR7ES) and change the plugs yourself. Torque to about 15Nm (IIRC). You should not be able to remove a spark plug by hand.
- alex
'85 244 Turbo
'84 245 Turbo
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