These cars don't fetch alot of money, even in near perfect condition and, with an automatic, the gas fours aren't much more economical than the smoother, more powerful six cylinder versions. Rust is a major issue on these cars.
Off the top of my head, if the rust is severe, maybe $500, If the rust is minor, perhaps $1000 or more. If the rust is minor and you fix the shocks, brakes and window it might bring over $1500.

The mechanical flaws you listed are fairly easy to fix. Are you selling because of these problems, or just have too many cars? If your heirloom 220 has been reliable, I'd be tempted to fix and keep it.

Happy Motoring, Mark

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DrDKW