The kits for disk brakes and power steering on the stock suspension are not a lot of money. You should already have the right steering box. The total cost would depend on how good you are at findind the rest of the pieces cheap.

1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble...