That's one of the emissions-control '70s British Strombergs. Significant differences from the Mercedes 220 Stromberg would include - four screws securing the top cover, calibration and throttle linkage for a dual-carb setup, electric choke located on the left, separate idle-air adjustment on the right, main mixture adjustment through the damper hole requires special tool, and no idle cut-off valve.

If you could find one of the early Mercedes 220 Strombergs, it would be a better parts match.
If you could fit it in place of your current carb, you'd gain a manual choke and lose the fragile damper oil reservoir, but you'd also lose the idle cut-off valve and all the work you put into restoring that.

Happy Motoring, Mark

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DrDKW