Does any one know what is involved in replacing this bush?Are any special tools needed?I believe the front end is the same as a Skyline.all

Simple swap over and is pretty easy to perform with basic mechanical knowledge.
If you can, try a set of radius rods that are rose-jointed and preferably adjustable for castor. Rose jointed for more accurate response and castor increase for better turn in and roadholding, without the diasadvantages of massive front camber on a road car(inner tyre wear)
Good luck and happy hunting