I bought the kit the Motor Trend article suggested, small bolt pattern. You can mount the Caliper Front leading, which is the way to go.
How-to Convert a Mopar A-Body to Front Disc Brakes
To save yourself some headache. Use the existing OEM distribution block. Plug the back line @ the block, then run a new line from the Dual Master Cylinder to the control pressure valve, then out of that to the existing rear brake line attached via a coupler. Read Brake line DONE.
Front line goes from Dual Master Cylinder into the top of the OEM distribution block, using existing lines, & Bobs your Uncle! DONE.
Have Fun!! & dont forget to buy RIGHT THREAD lug nuts!!