Taller springs & longer shocks (to maintain suspension droop or rebound travel) will get you so far with re-arched leaves in the back. Taller tyres will also get you a bit more clearance.
You can't go much bigger than what the Outback utes had at the front due to interference with the front upright. They ran 205/75/15 on zero-offset 6" rims, I have heard that 215/75/15's just squeeze in on the same rims.
Any bigger than that and your looking at custom made uprights (good luck getting them through rego). That's what Scott Hart's rally EB & AU ute run.
you could use the same method that the Subaru lift-kits use. Fit spacers between the front sub-assembly and the vehicle frame. On a Falcon this would be between the K-member & G/Box crossmeber and the frame rails. This way the engine, suspension, sterring and transmission all stay low so no extra clearance there but the body goes up for extra clearance under the middle. It'll still need re-arched springs in the back to level it off.
With Subaru's this gives them wheelarch clearance to fit taller tyres which then gives the extra clearance under the front end. With the Falcon you still have interference issues at the front unless you run extra offset to move the tyres way outboard - not a good look, extra stress on the front end components and won't pass rego.
Interestingly, up to 50mm spacers are OK with the rego people in NSW.
It's probably not as easy as it sounds as you still have to link up the steering column, coolant & brake lines, etc etc.
The XF's had a Country(?) pack option that gave a raised suspension. May be worth checking with Ford to see if EA onwards had a similar thing. But knowing Ford, it probably won't be real cheap - assuming you can still get it!
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