Yes, 3.0L Conversion will work on ATX vehicle.
Prep work is exactly the same as doing a swap on an MTX car...Yes, Crank bushing must be ground down(found out the hard way!)
Original ATX wire harness, and 2.5L ATX "Flywheel" must be used, but other than that, it's exactly the same as a 3.0L Conversion on an MTX Contique.
See Ya,
Bito