If the rotors are the smaller 10.8" dia BBP 14s should clear. My 74 dart parts car had that diameter rotor, and 14" rims. Show us a pic or 2 of the calipers and mount brackets. I bet they are the same or similar to U.S. spec ones.
If you go BBP fronts, will you upgrade the rear to BBP as well? I am upgrading the front and rear on my sons 69 barracuda to BBP. Using M body front discs, and a ford explorer 31 spline 8.8 disc brake rear axle. Even had 1/2" RH lug studs. Not sure but aussie falcon rear axle may work for you. Maybe the hotter V8 GT falcon with the good gears and a locking diff? It may be an 8.8 as well. Parts are plentiful and dirt cheap. I know the ford pass car and light truck axles in the U.S. are same bolt pattern as mopar BBP. Not sure about OZ or NZ though.