Brake Question

[1966JSM]

So Ive been thinking about swapping out the brakes in my truck to the 99 and up style and getting power steering. I upgraded my brakes on my 66 a number of years ago to the 73-87 setup I think. I bought it off brotherstrucks.com.

Question is has it been done and is there a kit or do I need to figure out all that good stuff , any tips would help guys.

Do I need to change out the whole front end, k member and control arms to the newer style. To get the brakes and power steering?

OR just keep the setup I have and get power steering and rear disc brakes and upgrade the front to a bigger rotor and 2 or 4 piston calipers.