Jeep 4.0 in 69 Barracuda

I have 4 wheel disk brakes on my 68 Barracuda. 73 and up disks on the front, Dr Diff disk kit on the back. Built slant six, used on the street, drag strip and autocross. No power brakes. Have never felt that I did not have enough stopping power.
Yeah I am staying with manual Dr diff as well.