Lahore is the worst place to try building a 4x4 because there is such a shortage of good craftsmen there. This alteration has to be done right to work properly otherwise you'll have issues with broken engine mounts, slipping clutch, overheating, engine not idling properly, etc. I don't mean to discourage you but you should know how deep you're going into this.
As far as I know, all ranges have the center stabilizer. Extra shock absorbers help with heavy loads so that's a plus. I know ranges have decent road manners but I would never expect any vehicle with a high CG to handle responsively like a car. Always keep that in mind. None of these vehicles like sudden steering inputs.
So what things have you done with this vehicle and why do you want to change the engine?
1UZ's original auto transmission can be used with 4x4. It has been done before but an adapter has to be made to couple the transmission to the vehicle's transfer case (the 4x4 box). If your range's transfer case is computer controlled, I would advise swapping to a Toyota transfer case without all wheel drive. That way you'll have conventional selectable 4x4.
The other option is a Toyota Prado manual transmission complete with transfer case. An adapter plate to couple the trans to the engine will still have to be made. A flywheel can be made from a blank piece of steel but only if you have a bad *** machinist who knows exactly what he's doing. Otherwise you'll have to use a modified flywheel and clutch set from either a 1KZ or a B series Toyota diesel engine lightened to around 15 kg. Don't use a smaller flywheel as the clutch on it won't be grippy enough. If you get lucky, you might find a 3S GTE flywheel which is a direct bolt on replacement.
A mechanic in Karachi says he can also set up a Prado auto box to work like OEM with a 1UZ. Apparently the wiring is very similar.
I suggest you thoroughly research mechanics and go for someone who has experience setting up these engines and has done reliable installations successfully. I learned the hard way and had to redo a lot of the electrical stuff myself according to the factory schematic to get it running right. The vvti motor is an even bigger challenge because most of the ECUs have a built-in immobilizer.
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