I'm puting AWD into my '96 X-90. It's currently 2WD.
They call me Mr. Stickler....
I mention this just in case what you typed above was not merely a slip of verbage...
Adding a transfer case and front axle guts to your X-90 (a rare, fun member of the North American Suzuki family tree!) will not result in "AWD".
"All Wheel Drive" connotates the ability to drive such an equipped vehicle all the time with power going to all four wheels.
Unfortunately, the drivetrain in an X-90 and all Suzukis of it's era are equipped with a part-time four-wheel drive system. It can only be used in 4WD mode on loose or slick surfaces like sand, snow, mud or wet pavement.
Bad Things will happen to the drivetrain if you drive your newly-"4x4ed" X-90 any appreciable distance on dry pavement.
BTW - my rectal area does have a very high Intelligence Quotient!