You can fit an XE upwards complete diff housing into the EA-EB series with only a couple of mods, like changing the Tail shaft yoke and altering the bracket where the handbrake cable fits.
I fitted a EB complete diff under my ZL Fairlane and this is all I had to do.
The complete job only took two hours so very little work to fit.
The Skyline centers do fit the Borgwarner diffs but depending on ratio's yo have to get the carrier as well.
"Fords R Tuff"
"Big Blocks" make them Tuffer.
You can beat Horsepower but you can't beat Cubic Inches.
Fords came out with Big Engine bays, Fill them with a "Big Block"
That's the way they should have been.