Just a basic mini tub and sprign relocation, while also moving the front eye of the leaf spring back about 0.75" when we relocated the springs years ago.
At the time I had 325/50s on a 10" wide wheel w/ 4.5" backspacing. I got the wheels and tires first and built the rearend and to fit. I like the look of the taller tire, even though some say a 30" tall tire won't fit in a Dart wheel tub.
"Those who say it cannot be done, shouldn't interrupt those doing it."