Disc Brake Conversions Using OEM Components

Mopar Action has an excellent article on swapping brake components:
http://www.moparaction.com/Tech/archive/disc-main.html
I swapped a 73-76 spindle into my '68 Barracuda which originally had KH disks. Wanted the 4.5" BP. I used the 11.75" cop rotors and caliper adaptors from a later car with sliding calipers. These large brakes work wonderfully with a light A-Body. I also used B-Body 11x2.5" rear drums. Heavy, but they work.
I would consider aftermarket disk brakes, but $'s always get in the way. That is why the 73+ A-Body spindle swap is so nice.
Bob