I've been doing this for 20 years, that's pretty bent, so I guess I'm straight.
You can get a dozen used 4A1 carbs and the chances of finding one that works better than what you have is slim. Like I said earlier, I can had you a pristine new one or you could spend about a third of that fitting a "good used" US carb. Most of that money will be for getting it mounted and have the linkage fit. This is not a job for the average mercedes mechanic. You want somebody that knows 70s US cars and has a decent head on his shoulders to not cut the corners too much.
A happy medium is a Holley carb with a Jam adapter kit. Brand new, it's closer to 700$, but it will give you a lifetime of service. They can be found used.
-CTH
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