Like i've said in other post's once you have converted to disc brakes,,be aware that your stock rims may not fit over the brake calipers,,,and if you do try you may find your front wheels jammed solid.
You could always go to an auto wrecker and pull the entire control arm/to wheel combination of any late seventies full size chevy ( watch your tie rod position )from thereon in,,,, your in fabrication city.