I have an elderly lady friend who still drives her 1960 220S. Over the last sevral years she's been told by a few 'mechanics' that she needs new carbs when all she actually needed was a fuel line or jet-holder tightened or some other adjusment. Unless the carbs are REALLY bad- (Been parked in the woods for years or under water) and if the car is still running, I'd recommend repairing / rebuilding them. I've heard of Webers availible as replacements for the Solex carbs, priced in the $500 to $1000 range. I've also heard about problems with adapting the Webers to fit Mercedes
(trouble with throttle linkages and not fiting the original air filter unit)
Good Luck, Mark DiSilvestro
1972 250
1972 250C
1961 180b
(and 2 DKWs!)

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DrDKW