Hi, You will need the crank from a 1Y diesel engine
Then you have a choice, you can either offset bush the crank bearings or you can have the pistons machined, the height is reduced by about 1.3mm.
This setup will give you a 2042cc engine, for a true 2.1 you will need 83.5 mm pistons which you would have to source from elsewhere, you would be better of getting custom pistons made rather than machining brand new pistons.
The standard digi fuel system will fuel that just fine, think its good upto around 176bhp iirc