I remember there was a user here who did this swap, I just can remember his name
Did he change the subframe to that of a EG or DC2? as from what I have heard those using EKK2 mounts designed to work with EK subframe found the handling effected badly as the engine is positioned to far forward putting all the weight past the front wheels making the car really unbalanced.
New engine mounts, the gearbox needs new shifter cables etc.
New loom etc
take a look at this. maybe it will give an indication of what ur outcome could be.
YouTube - EK9 K20 standing start Icetronix