320 engine is larger. The Supercharger of a 230 is situated to the side and takes space which might not fit in the engine compartment once the 320 engine is fitted inside. The 32 (AMG) super charger is quite different I think, and this is why it's used along with the 3.2 liter engine.
You know, even if it was possible, you might have to update the gearbox, change other stuff, and it would simply cost too much. You can get a second hand AMG for quite cheap now. Sell your current car and buy an AMG. You'll most likely get better seats then you currently have, some other cool extras, the car might be more recent (especially if yours is a 96-2001 model), and you'll know for sure that the car will not break down after 1000miles.
I would say "don't do it", but if you DO want more power out of your current 230k, change the pulley, you'll get an extra 30hp and a 99% chance that the engine will never break.