Which master cylinder for 4 wheel disk brakes

Not for me. I used a newer MC w/ adapter plate on my 1964 Valiant, and the pedal is in the same place (photo, your results may vary). The MC is 7/8"D bore, which is the smallest I have seen (i.e. easier pedal). MC is for a 95-99 Mopar "cloud car" w/ ABS (Breeze, Cirrus, Stratus), and probably many others would work. I super-glued the 65 boot to the new MC (2nd photo). The bracket is from an Intrepid, on which I mounted an adj. proportioning valve. Haven't driven the car like this yet.

Cloud cars have 50/50 split master cylinders because they are diagonal split cars (FR/RL on one circuit and FL/RR on the other).

I highly advise against using one of these. You'll want a biased master cylinder from a F/R split vehicle. This could be an F/J/M body, a Jeep Wrangler, Chrysler 300, etc. All a better choice.

I have a 15/16 dakota master cylinder from Dr Diff