As long as you keep the boost down to acceptable levels for the compression of the 3.9, run a intercooler to keep intake temps down and lastly keep boost levels at a level that the fuel management system can compensate for you should be fine.
On carbed 85 mustang I learned some of these lessons the hard way.
One of the hard parts for me is fab work is not my strong point, so I cheated. I found by swapping the stock manifolds left and right only a small bend pipe with plate welded on was needed to attach the turbos and the return routing was not to hard to plumb at that point either.
Intake temps were high but not dangerously so, but a intercooler would have made a drastic improvement for the 5.0
The problem I ran into being young and somewhat in the dark was boost control. The wastegates that came with the turbo's I was using (a pair of turbo's salvaged from a Thunderbird Turbo Coupe) cut off at I want to say +-15 psi. This is where I went wrong. I tried to dial them back a bit but didn't take into mind compression and dial them down far enough. I ended up causing some serious damage in about 3k miles that ended the engines life.
Just think through everything and stay down on the boost. I would guess the engine could safely handle 6-10 psi in stock form. Of course that is given the engine is in solid shape.
After that you have to give thought to the transmission that is sitting behind it and the transfer case. I don't know what they can handle. Something tells me it is not a impressive number though.
We can talk on sunday and I'll give you a complete run down on what I did and what I learned and what happened in the end....
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91 Range Rover Classic
90 RRC Parts truck
94 Saab gas mileage beater 
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