Would changing my pump timing change the timing chain stretch from 3 to 5 degrees?

Should I change the timing chain - it is now showing 5 degrees of stretch?

Plus, back to my black smoke - since this is new SINCE I timed this injection pump, I'm assuming this is unburnt fuel - is it more likely to result from too far advanced or too retarded pump timing?

ryan

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE