Disc brake conversion

What brakes currently are on the '69 Dart?

Also, I assume you know that you're changing from a 5x4" bolt pattern on the Dart to a 5x4.5" bolt pattern on the E-body brakes. Are you converting the rear axle pattern on the Dart as well?
Drum brakes not sure what size, yes changing rear to 8 3/4 large bolt pattern also