How much advantage in adding rear disk brakes?

Is that an 8.25 rear?? How did you do the e brake setup?

I was thinking about doing this to my '42 Dodge pickup because it has an 8.25 and I have the Jeep brake setup laying here.

I have the e-brake working well on mine. Couldn't see doing without an e-brake due to the 4 speed. I used the GC cables by cutting off the end of the factory cable and then "un-swedging" the jacket end. Then I cut the jacket down and put the original jacket end back on (didn't swedge them though) and just stuck that in the OEM e-brake mount on the frame. Then I tried to get the cable cut to the right length and get new ends swedge on. I say "tried" because they were still like 3" too long and required a loop in the original cable to get everything working. Need to go back and fix that. But it has been working well, holds the car on a good hill.

Be aware that the cable is plastic coated, so make sure to strip that off before getting new ends swedge on. I didn't and pulled the end off one cable on the first go round. Luckily it was when I applied the brake and I was still sitting in the car so I could shut the car off and put it in gear. Hate have seen the results if I had been away from the car and it started rolling.