Brake line routing: old vs new

[Canada20]

Hey all. I swapped in the front crossmember of a '72 C30 to do the disk brake conversion and I'll be using the MC/booster assembly from the same (unless I find a newer one to fit, of course). It looks to me like GM changed the routing of the brake lines and location of the distribution block somewhere between '69 (the year of my C20) and '72.

Are there any good sources for the differences between these? I think I'm going to try and replace all the lines on the truck as the old ones are...well....old and the system has been open to the elements for some time now.

Many thanks,

Greg