Hi all. This is a tough question to write, but I'll try and be simple. I'm thinking seriously of buying a 1989 560SL, which has the 117.967 engine. I now have the engine manual which I acquired for my 1985 380SE, which has the 116.963 engine (manual came with the chassis and body manual for the W126). This manual covers the years 1981/82 engine for the 380SL and the 380SEL, and has been very useful to me servicing my 380SE, even though it's a 1985 model.
I have been looking around for an engine manual for the 560SL 117 engine, and will have to pay quite a bit for one, in the hardcopy version that I want (I DO NOT want a CD, thanks). My first question is: how different are these engines to service, such as lifters, rockers, valve seals, injection system, etc., such that I'd get a major benefit from buying a 117 engine manual?
As an aside, I used to have a 1975 450SE, and it had a 117.983 engine, and after changing the camshafts on that engine, plus a lot of other typical jobs, I could not see much difference between that and my 380SE's 116 engine. So I guess my second question is: is there a similarity, other than the number, in the 75's 117.983 and the 560SL's 117.967?

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1986 560SL
2002 Toyota Camry
1993 Lexus