booster selection HeLp

[jr2k3_esq]

Hey guys,
Been a while since I posted here, my project has been back burnered for the last 18 months with arrival of my daughter. I just got enough spare cash to get a couple parts but I need help with what I need. Here's the story.

I have a 1970 C20 LB that I have swapped rear axle and A-Arms out with C10 gear (5 lug off a 74)

I need to get a drum/disc master, and a booster off a C10 as well do I not?
I went to the parts store today and when I asked for a booster for a 71 C10 he asked me if I wanted an AC Delco style or Bendix. I didn't have an answer for him and am here now.

This is what is currently on the truck:


From what I understand it's easier to get a booster off a 71-72 for an easier fit, same with the disc/drum master correct? as well as a prop valve.
Is there a difference between the Delco and Bendix style? would either work? Any help with a parts list and info would be great! I am starting to hurt in my heart when I see my poor ol girl sitting so dormant and this gives me new hope. Thanks again

JR