I just bought 2 '79 60's for my TJ. I got to get gears, lockers, set up kit, brackets, steering, another job and learn to weld. O and a bigger motor to push the fawkers. That doesn't include building the suspension links, working the fenders, tires and wheels, Full tank, bumpers and a stronger cage to keep me safe in an upside down heavier rig.
I say make a bracket jig before cutting off your old brackets, cut them off, weld them on using the jig you made. Then maybe some how use one of your old yokes to make some sort of booty fab flange connections. Run stock new rubi rims to suck the tires in alittle more and your set. O and then buy some new tires no bigger than 37" cause of the 4.10, and beat on 'em. You'd still only be in about 4and one half g's front and rear. DOIT.