Unless you take the inner knuckle off you won't be swapping to manual hubs by interchanging parts. Also, the Dana 30 will be 27 spline not 30 spline. The rear Dana 44 is 30 spline if it's a '72. Prior to that they used 19 spline and 27 spline shafts. Not to mention being offset as well.
For a rear D44, you could go with a Isuzu Trooper or I think Amigo. XJ/ MJ Dana 44, TJ Dana 44, Scout II Dana 44, SJ Grand Wagoner... The Isuzu's will have disc's if that what you want. The Scout will have a slightly (2") off centered diff which is nice since both axle shafts are the same length. Drum brakes will range from 10x2.5" to 11x2.5" depending on where it's from.