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Your engine (116) is different than mine (117), but the following MAY be useful.
Firstly, you may HAVE to remove the distributor to remove the water pump. This is not a big deal - but I hope you have the manual, for torques, etc. You can get into a mess if you don't put the distributor in exactly the way you found it. No way around this. I did manage to do it without removing the ignition wires (if your wires are old, this in and of itself is risky, because they get old and brittle). I turned the engine (clockwise only!) so that the mark on the dist housing lined up with the rotor (0 degrees on the harmonic balancer), and then removed everything.
Secondly, I HAD to remove the lower pulley, even though there are those two notches. It looks possible, but beleive me, I tried and tried, and actually got the bolt loose, but there wasn't enough room to remove it, even with the notch. Older manuals for the 450SL claimed that this could be done, but I think that water pump was shaped slightly differently. Some people have replaced that lower bolt with a stud and a nut for this reason. It's a lot of extra work for a bolt.
Removing the lower pulley is not as scary as it seems. There are six bolts holding it onto a flange on the crank. Mark how it went on because the holes are not exactly the same distance apart and since you can't really see the bolts as they go in, finding the right position can be frustrating. Don't ask how I know this.
Once the pulley is removed you have to get off the harmonic balancer, which on my engine was just a metal ring with a keyway. Use liquid wrench or similar at the interface between the crank and balancer, walk away for a few hours, and then lightly tap outwards around the balancer. It will move and eventually come off.
Because you will be removing a lot of torque-sensitive stuff, I would very strongly recommend getting the manual on CD.
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