Drums to disk swap, small to big rotors ?'s

Hey gang.

I have a '74 Duster w/ 4 corner drums.
I picked up a complete stock disk set up of a '75 Duster. Small disks.
I also have a complete big disk set up off a '79 Doba.
I want to use the big disks from the later year B body ('79) on the stock A body arms and spindles. ('75)

Theres the parts, heres the question(s);

When it comes to the brake hose from the body to the caliper, what is the length I'll be needing?

Is there a stock length I can use?

Is there a problem in in the way the hose mounts to the caliper. As in different style mounting pad, hose end. I could be mistaken, it's been a good 15 years since owning a Duster, but, aren't the caliers mounted in front of the spindle?
The later B body calipers I have are mounted rearward of the spindle.

See the problem I'm haveing?
Thats it. Thanks.