Doc,
I finally found time to get the number off the 500 block I had ask about.
117 961 12 003168
My 84 500SEL should have a 117.963. in it. Do you think there would be enough difference that I should change it to a 117.963 or just leave the 961 in the car. I just bought ($200) an 85 500SEL as a parts car which has the correct engine in it. The condition is unkown but it shows 250K miles which is about the same mileage as my 500. It was running until about 2 years ago and then abandoned at another shop. They had done brake work, valve guide seals, and some other minor work and the owner never came back for it.
Thanks for any information you may have.

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84 500 SEL (307,xxx miles)