Educate me on brakes and steering please.

[jmlcolorado]

I'm building on a '68 C10 chassis right now. I am about to do the disk conversion up front by getting '73 spindles, calipers, rotors and outer tie rod ends. My question is are the calipers meant to be used with a power booster? I dont plan on adding a brake booster until later.
I will obviously need a prop valve now but will i need a different one once i add assist?

Same thing with steering. For now I'm sticking with the manual box but later i will be adding a pump and power box. Is the '73 power steering box a direct swap with the 68 drag links?

Do you recommend that i upgrade to power brakes right away or can i wait till the funding becomes available? I'm working on a tight budget so I'm trying to take this one step at a time.

Thanks for the input.