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JMHO, rear brakes do almost nothing to stop your truck, I would consider a rear disc "upgrade" to be something you would do after your truck is 110% complete and you still have extra money to throw at it.
Okay, is there a truck or car I can steal the front brakes from that would be bolt on without aftermarket parts being needed ? Since that would be more benefit than rears
1973-1979 Ford trucks front disks and sway bars directly bolt on. The steering linkages do to except for I think the tie for ends due to the disk brake caliper. There are many threads on this forum that cater to this swap. I suck at searching myself but give it a try