The easiest and most original way would be to buy used NAPCO running gear. That is what I am doing to my 55 2nd series. It is pretty much a bolt in job (emphasis on pretty much). But you will have to deal with drum brakes. I purchased cross drilled rotors and am installing power brakes to make it safer. Then you can claim you have a semi-original truck. And the axles are just awesome looking with their military design and the steering tie rod behind the front axle.
