Those are good axles. The rear is easy: cut off the old perches, and weld on new perches at the correct spacing.
The front is trickier, depending on what you want to get out of it. You can either narrow the axle, or outboard your springs. The second part is setting the pinion angle and the caster angle; the pinion angle can be adjusted with shims, or if you're careful you can grind the material away to get it kicked up a hair--or if you go SOA, you'll weld your new perch on the left side at the correct angle, then it's a lot of grinding on the right side to create a space for a perch, and then needing to pre-heat the diff to weld the perch to the cast iron. The caster angle does require grinding the welds off the yokes, rotating them, and re-welding.
The Scout axles are 5x5.5", so that's handy. The fronts have slightly upgraded brakes, and I've never had a problem getting brake parts for it. Or you can swap the knuckles for the CJ knuckles and keep running the CJ outers.