70 4x4 sub brake questions

[madnad15]

Hi all , im a new member to the forum , but have been lurking for a year or so, you all have some great info and knowledge. I have a few brake questions that im hoping someone can help me with, Ive got a 1970 4x suburban, with drum brakes all around, im gathering parts to do 1 ton axle swap, this is currently my daily driver so would like to have it buttoned up in a weekend.

1st question , can i use a 1/2 ton master cylinder and prop valve? (eventually going to go to hydra boost, so just looking for something that will work)

2: Front brake lines, currently stock, set up for drums, i believe to be 1/4 line, i have received conflicting information, do i need to swap out to 3/16 line or will the original lines work ?

3: If stock brake lines are usable, what Brake hoses, what size fitting is the original drum brake fitting where the outboard brake hoses attach to the frame brake lines? I need to build or buy extended lines , and would like to have them before i start the project, I know alot of people have have done these swaps, and i cant get any of the brake hose manufacturers to clearly answer my question.

Any info or advice is greatly appreciated, thanks Chad