If you have the stock axle I'd use that along with the spindles, maybe re-arch the springs to drop it down some. If you sniff around here or do a Google search I bet you can find how to adapt disc brakes to the spindles too.
I have the stock axle and spindles, the steering ball on the LH spindle arm is loose, not sure that's repairable. King pins and bushings are worn badly.
You can put early ford spindles on your stock axle. Plenty of steering hoop options and brake options there. You can buy new willys jeep springs to replace your pickup worn out springs. I drove mine with the stock front with a mopar steering box and original drum brakes. Ended up switching to a mustang II. Rode much better Sent from my iPhone using H.A.M.B.
I'd contact Steve at Industrial chassis to see if one of his Dodge Dakota kits might work. Better than MII for sure.
I used an oem crossmember. This was back in ‘95. Broke kid building a truck. Was pretty simple. I think the Dakota would be too wide. Sent from my iPhone using H.A.M.B.
I rebuilt a stock 39 Willys about 2 years ago. King pins are not bad too do. I rebuilt the stock brakes as this was a mechanical restoration.