If your rack needs rebuilding you would be better off buying an exchange unit and just fitting it yourself .
You can use any of the repair manuals for that (Max Ellery, Gegory's or Genuine Holden Manuals).
A complete reconditioned rack should be around the $200 mark (plenty on eBay) and they're very easy to fit. I didn't have a manual handy when I changed mine and didn't really come across many problems.
VL ~ VS racks would have to be almost the easiest Rack and Pinion steering gears to change on 6cyl cars. The exhaust can be a pain on V8's. Simplest is an exchange unit as you can sometimes run into strife with damaged seals without the proper seal protectors.