according to my local offical Mercedes Benz service agent in brisbane, the stromberg and solex from those era of cars should seek further solice in a nearby garbage bin..

they work well for a few months, but then turn bad!. a holley economaster 280-320 is normally a good worthwhile replacement.

this is going from my personal experience though, it could be different.

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W114 1969 250CE - M110
W114 1972 280S - M110
W116 1979 450SEL - M117