Thanks for the tips, all.

My timing chain is newer, replaced about 3000 miles ago. The injection pump was rebuilt 2500 miles ago and I dialed in the timing to get 1 drop/second. That doesn't mean that it's shifted since but I doubt it's off my much, if any.

I'm waiting for a call back from the shop. After checking the receipt, I see a note: "adjusted to spec 140" Spec on NA cars is 115 :/

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1974 240D "Boldie" 170K.- New timing chain/freshly rebuilt IP/replaced valve seals/injectors/upgraded stereo/new Bilsteins with Yokohamas/fresh paint and rocker panels plus lots of welds.