Help with 73+ brakes on '70 GMC

[HeavyD]

Hello all. I have a '70 GMC that I am swapping the entire front end of a 1975 chev onto. I have a question about the brake hoses. What calipers and hoses do I use? I have read the 71-2 are different from 73+, and since the 71-2 disc swap requires "special" hoses from Early Classic or similar to adapt to 1970 and earlier lines, this would mean that I cannot use the 1973 calipers?!? Can I use 1971-2 calipers? Are the rotors the same size on 72- 73+? Please help as I am new to these trucks and a little confused..

I also bought the steering box..and will be using a 73+ pump most likely..will the 73+ hoses work fine? Am I missing anything?

Thanks all.