The issue is going to be how the E-brake cable mounts to the brake backing plate, and the parking brake arm. The rest is a matter of the mounts, and getting the right length intermediate cable.
I bet you have the 12" X 2" drums, which was not used much after the early 70's. I don't know if you can swap to a newer backing plate or not. I would take the gamble, and hit up a junk yard, for all the parking brake stuff, the backing plates, and the brake arms off a later Dodge. If you have the 12" X 2&1/2" drums, then I would grab all the rear brake stuff, I would bet they will bolt up.
I wish I knew if the 2&1/2" brake stuff would bolt up to a 2" axle and hubs. From what I remember (about 20 yrs back), the 2" backing plate is relatively flat, and the 2&1/2" is dished to the inside a bit, so I would put my money on the stuff swapping, but I'm good at taking risks.
If you could pull a wheel, and take lots of pics from all sides, we could give a better judgement.
Also list what you have, e-brake pedal, front cable, brackets, ect. Pics would help also.