Looks like yours is a 71, so IRS? Your axles will be the sticking point. There's an article in Hayburner this month from Rapid Rodent racing, custom axles with inner UJ's. I'm sure there are other ways, but cutting, pinning and welding them isn't one as a friend of mine found out on his narrowed rear bus, they snap.
Sway-a-way make custom axles, which is another option.