ANOTHER 6 lug disc brake question

[Kyle70SWB]

I have spent most of the day digging around online, and on here, and every post I see has different answers..

I have a 70 SWB, and will be adding power steering, and power brakes.

I am going to piece this together slowly before I even think about tearing it all apart, and I THINK I have figured out the easiest way to do the drum to disc. I do NOT want to order a full kit from a company, because I want to be able to run to the local parts house for parts when I need them.

I am really looking for someone to double check my thoughts and correct where I am wrong.

Am I reading that I would basically take a pre-87 front suspension, everything EXCEPT the control arms, and bolt it to the 70? I know I will need a proportioning valve, and will also be getting a new master cylinder and booster, but don't I need those from a 72?