The radiators in later, a/c, turbo cars with electric fans were larger. I doubt an older, viscous fan will fit in the same fan shroud so you’d have to work out a way of fitting a smaller shroud over part of the radiator. Or, of course, fit a smaller radiator.
Similar considerations will apply to swapping out the water pump pulley. There were two sizes for the B230 so you will need to check that the viscous fan clutch is compatible with the smaller, turbo pulley. Or, accept a slower pump speed as well.
The whole project sounds like a recipe for overheating if you ask me!
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