Outer Limits 4x4 Board

I am currently restoring a FJ45 and want to do a spring over conversion. I have seen snake racing does the new spring mounts to weld to the diff housing. Do I need to change anything else? I also want to fit power steering, I have been told that a 60 series box is a good conversion. Could anyone tell me if this is true. And one last question disc brakes - can you use the original diff housing and just change the swivel hub assembely or am I better to go for a latter model diff?

Any replys will be greatly appreciated......

yes u can use your diff housing for disk brakes .