Superior Engineering gear is top stuff, so I would look at heading in that direction.
Can you grab the whole front diff with arms attached from the wreckers at a reasonable price? Then it should all just bolt straight in, and hopefully all be straight,
Are the radius arm chassis mounts still straight? With that amount of force and movement on the arms, I would be surprised if something else including the diff housing didn't end up slightly modified too.....
Hope it all comes together for you.