i got my 2inch drop stubs from castlemain rod shop about 4 years ago cost $450.00 back then, they take hQ rotors and brakes or torana brakes , the paper work that comes with the stubs is a bit rough but give you the basics to work it out,you need to graft in a hQ lower balljoint and reshape the end of the a arm for disc clearence, the back of the stub needs to be milled for spacers and longer bolts for the steering arm, the spring tower needs to be trimed for caliper clearence, this setup also narrows the wheel track by 1 inch per side which allows for deeper dish rims.
hope this helps in the discission making