67 Dart GT brake options.... 13” wheels

Honestly, I'd be thinking about using something more like a 1990 Chevrolet Cavalier Front braking setup since it has 5x100 bolt pattern which is almost right on the original 5x4". They also have a 9.69" vented rotor.

Not sure what you could get for pads but it should be easy to make a plate to adapt them to the knuckle, they aren't really all that different from the scarebird celebrity brake conversion.

IMO brakes this small are kind of inadequate anymore but that's up to you.