Well we sat down & worked out a price guide for the TDV8 conversions;
A rough guide of costs for these jobs;
3.6 into 2.7 D4, ~$31,000 (2010-2012MY, 6-speed)
3.6 into 3.0 D4, ~$40,000 (2010-2012MY, 6-speed)
3.6 into 3.0 D4, ~$43,000 (2013MY, 8-speed)
4.4 into 3.0 D4, ~$52,000 (2010-2012MY, 8-speed conversion)
4.4 into 3.0 D4, ~$49,000 (2013MY, 8-speed)
4.4 into 3.0 D4, ~$50,000 (2014-2016MY, 8-speed)
Obviously this doesn't include the cost of the vehicle itself.
The exact cost will depend on what you pay for the engine & transmission, esp for the 4.4 the price of these engines has gone nuts, recently one was sold out of a wrecker here in Sydney for $25k, just the engine with turbos.... the 8HP to suit the 4.4 is typically $5k now. To buy a 3.6 engine & transmission is significantly cheaper, or you buy the whole vehicle just the engine & gearbox. 
If you are starting with a 
2010-2012 3.0 and go 4.4, then the conversion from 6HP to 8HP is part of the job, if you wanted to put an 8HP behind a 3.6 in a 2010-2012 it's also possible for additional costs. 3.6 into 2014-2016MY D4 is not feasible because of electronic architecture differences.
Supply of engine & transmission, control modules
Sensible work done while the engine out, turbos & injectors refurbished, new hoses, etc
Wiring swap or modification in engine bay & cabin as needed.
Custom exhaust & other custom work e.g. engine mounts for 4.4 are full custom.
Some cost recovery may be possible if the original transmission & engine are good (usually they aren't hence the conversion).
And the old turbos of the 2.7 or 3.0L provided as cores to for reman service but not a lot of $$$ these days.
The main thing is this is not swapping all the RRS wiring and modules into a D4, the D4 still thinks it's a D4 so the rear aircon, tailgate locking aren't messed with, it still shows a Land Rover logo on the touchscreen not Range Rover, the VIN when you plug in with a scan tool is the original Discovery 4, not a donor RRS. This is the way to do it properly, and it's how we do it. The guys who don't understand the software in these cars swap everything over.
For a supercharged V8 D4 it's only sensible to start with a 5.0 V8NA 2010-2013 or a 3.0 V6SC 2014-2016, throwing in the conversion from diesel to petrol and all that just doesn't make sense. And if you start with a 5.0NA or 3.0SC then you don't need to swap the transmission, the original 6HP28 or 8HP70 bolts up, just needs a modified tune. If you're converting from diesel to petrol you need not just an engine, but a transmission too, and everything else. Not worth the bother. Budget $20-$25k for a good low km 5.0SC from a wrecker. Otherwise these are the easiest of all the conversions (to do the job, perhaps not to pay for). $10k in labour & programming is realistic.
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