Using mustang rotors for 4.5" bc

I'd be very interested. I'm planning on using KH brakes on my 1970 Dart, have everything from spindles, calipers,pads brackets, and rotors.Upgrading the diff to a D60 with BBP axles so it makes sense to find a method to change the front discs to BBP as well. These rotors are in great shape and I'd love to re use them.
I haven't forgot. Been busier than a one legged man in an *** kicking contest.