Re: which booster
If you wish to use an XW-Y,ZC-D,XA-B,ZF-G Brake Booster and Master Cylinder,or anything similar or later...Then your XR Firewall will require significant Modification first !!! I may be able to help you with a VH-40 Booster,but I do not have the Lines or the Original Ford Bracket,though I may be able to Fabricate one for you at a cost. I am also in Melbourne!!