Your car is a r107 chassis with a 117 engine. Your 117 engine is a 5.6 liter overhead cam V8. It uses the CIS-E fuel system which uses O2 sensor and Computer to control fuel mixture.
The 107 SL was made from 1971 to 1989 and used a lot of different engines. The 560 or 5.6 liter was used from 86 to 89. In 89 they changed to the R129 chassis with 3.0 and 5.0 l engines.

As you can see, if you discribe your car as a 107 with a 117 engine it could be a lot of very different cars. If you discirbe it as a 89 560SL (which you did) everyone knows what you have. I wish people would quit using the chassis and engine numbers when asking questions as it leaves a lot of un answered questions about what they are working on.

PaulM

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84 500 SEL (307,xxx miles)