I have the ENTIRE front brake assembly, including steering knuckles off a '73 laying around.
They are yours if you go back with 'Stock' brakes.
I have no use for them and they are in my way. Pay shipping...
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Your other option would be to use the steering knuckles, brake calipers, hubs, sub axles, ect. of something '79 with 6 bolt lockout hubs and two bolt brake calipers mounts.
The 'Easy' way to do this is to buy a front axle from something with 6 bolt lockouts and two bolt calipers.
People are always swapping in
Dana 44 fronts, so
Dana 30 with disc brakes are easy to find and reasonably priced.
Don't forget to adjust the drag link or your front wheels will point in crazy angles! (ask me how I know this...)
With some modification (Minor Grinding) to the actuator rod, a '79 Disc/Drum master cylinder will work pretty much stock.
This will give you DISC brakes in the front, and a master cylinder set up for Disc/Drum.
You will need a combination valve for Disc/Drum...
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Are the back brakes missing also?