Welcome to out forum
As long as you don´t swap to an turbo engine you dont need to customise any fittings.
All b2xx blocks have the same casting. The only major difference between them are the bore measurements.
You need to swap the oilpump,oilpan and the flywheel with clutchdisk on your b230 engine, and don´t forget to plug the block mounted dipstick because all oil pans from 300-series has it monted in the oil pan itself. Kind of obvious when you have the two engines in front of you. But its good to notice you before you start to disassemble your car.
Sorry for my rusty grammar
