any machinist should be able to make calliper brackets, to use s13 rear brakes, will cost from $300-$600 (cheap and easy to get, plus souring rotors and pads in good compounds is easy compared to 86's) then call up any diff specialist they should be able to swap mounts over and straighten it for you, if you dont have a diff to nick the mounts off just go to a wreckers and find an old adm sprinter or roller and your off...
very rarely dose anything to do with modifying cars just bolt in