You will avoid a bunch of the hardest work if you skip the tentioning rail (I presume this is what would be called the pivot rail as it does pivot about item #50.

All of the problems with MB chains in the first 300k have to do with the three rails breaking. Somewhere over 300k the lower rail #71 will wear through and cause problems. That one might as well be waited on as it requires the whole front of the motor to be removed which might as well happen with the head off fixing the bent valves.

The only special tool I can think of would be the chain link riveting tool and the chain loader tool.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician