Ah, the short answer is that you need a bellhousing. the alloy and cast iron motors have different rear diameters. A 3.5 ready 4-speed will set you back about 1,000$.
Why would you want to stuff all that into a 190E. Even if you had a 190e 16-valve, it's still a W201 chassis car. Small, compact and kinda homely. Add a big motor and it will be nose heavy and drive poorly, if at all.
If you have to do a motor swap, either start with a more cool car like a W107 car or an older cooler sedan.
-CTH
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