Nice question. I have changed my huck brakes to bendix, on my 48. Doing so, I decided to change from the huck brake master cylinder to the bendix. The lines were replumbed to match this change also. I found that the lines entering the front brakes entered from the rear where the later (I used 53 lines) entered from the front. So, until I can get the correct length lines I put a pigs tail in the line. I am using the brake line kit I purchased from one of our vendors.
I have not put this truck on the road yet so I cannot give you any information from a test run.