81-83 380's did have single row timing chains. We have converted probably 50 or more. Haven't done one in years as its amazing for one not to have failed by now. They rarely went much beyond 100k miles.

I don't know how much the gears cost anymore but the labor is around 25 hours.

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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician