Individual parts are probably available from MB (with the exception of that cam). The carb is basically the same as the one used on 280 M110 cars up to 1976 (injected afterwards).

I can't suggest a replacement unless it would be from the 280 with some rejetting.

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