Can an offeset key be discerned without taking the sprocket out?
I have no idea if the chain was ever replaced by PO's. My hunch is no.
I'm still amazed at how much better the car runs with the valve adjustment. If I can get the transmission shift points set right, it'd be a real sweet ride. And I know what "right" feels like. I drove Tyler's Ol Turbo when I drove out there last year to look at a car he was selling and had a chance to drive it. That car was sweet and shifted crisply and smoothly, no lurch whatsoever.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked