I am at the dealership (used to work here) they will swap the pumps for $500. It kills me not to do it myself but it is worth it for me to do it and have the timing done right.
I will update you on the progress. Said it will take 4 hours. They still have some old school techs working here.

Mark

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91 300GD SWB with transplanted 87 OM603 turbo motor