OK, Getting back to the OP's question about restoration tips. Here are a few more assuming that you are going for accuracy according to Mercedes Benz Club of America (MBCA) guidelines. The guidelines are original parts or whatever Mercedes Benz is currently supplying. Hoses for example must carry Mercedes Benz stampings to be considered "Correct" The battery since the original tar topped Varta is no longer available must be a genuine Mercedes replacement which is currently a white case. Almost all the plated parts under the hood are Yellow Cadmium plating but since Cadmium is fairly poisonous Yellow Zinc is an acceptable substitute. The exceptions are the straps that hold the coolant expansion tank with the radiator cap on it, The strap that holds the power steering reservoir to the bracket, the wing nut and washer on the power steering reservoir and the battery hold down bolts and nuts. This is not a complete list but will get you most of the way there. The original radiator cap will have a "100" on it and should be retained.
As far as I know there are only 3 Black Oxide finished parts, The bolt that holds the alternator adjusting bracket to the engine, The eccentric bolt at the very back of the power brake booster and the big bolt at the front of the crankshaft that you will most likely leave alone unless you are replacing the front seal.
Hose clamps have been covered here extensively. Basically, they all need to be of the same type except the clamps on the power steering return hose which are special clamps. Authentic Classics (Staten Island?) sells complete sets of Norma clamps as the original Gemi clamps are not in production.
A couple things are pretty much unplatable unless you have specific tools or knowledge. The big solenoid right on top of the intake manifold (CSS or Constant speed solenoid), the big solenoids on the back of the injection pump, the small solenoid on the far right on the engine(cold start injector) all don't like being immersed in plating chemicals and are all expensive to replace.
If you car is an automatic you will most likely have a switch on the side of the throttle body that has a brown bakelite cover. Use care removing the wires since it is easy to crack the cover and it's price comes with 3 zeros.
The pipes that run from the injection pump to the injectors must be plugged before plating as the plating chemicals will cause the pipes to rust internally and can actually clog to the point of stopping the fuel entirely.
Pretty much the high points for now.
