Need to know sparkplug gap for a M116 engine.

[rickjordan]

This will be I am sure the first of many questions I will asking, being it that I have now bought my first gasoline Benz. My other 2 cars are diesels. I have ordered new sparkplugs for my newly acquired '83 380SL. Do these plugs come pre-gapped(Bosch)? If not, what is the gap setting? I don't have any maintenance manuals on this engine just yet, so any tech help I can get to sort this car out would be greatly appreciated. Presently the idle on this engine is rough, in that it "lops", if you know what I mean. I removed one of the plugs and the gap was huge. At least more that I would expect. My past experience with German gas engines, tells me the gap should be something like .23.
Anyways, any help with learning about these engines, tech specs and such would be appreciated.