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Seems a lot of people do this conversion, so you should get some answers soon.
Engine mounts need to be changed, wiring, throttle cable to a VN type I believe.
I was thinking about changing to a 4.2, but decided to just install new zd30. Total cost so far around is $13500, this is with brand new everything. Injector Pump, water pump, Engine, timing gear, Alt and Starter, Radiator etc etc. Every thing is brand new, not recoed. Could have been cheaper if I went recoed. I would have saved 1500 alone if I went for a recoed injector pump, but got a new one instead.
I like the 4.2, however i think the ZD30 is just as good engine, you just need to be aware of the earlier models limitations. A lot of people have got later model ZD30 with no problems. Mine has done 260k Kms. I am upgrading as I am moving to Tennant and towing a 24ft van. Thought it would be cheaper and easier to renew it in Newcastle than remote NT.