[Accelo]

Are you staying with drum brakes? They interface where the tubing connects to the flexible line from the wheel cylinder is in the rear of the cross-member on the 67-70 trucks.

If you are converting to disk brakes? The factory interface where the tubing connects to the flexible line from the wheel cylinder is in the front of the cross-member on the 67-70 trucks.

Conversion kits, for 67-70, can go either way, but typically use the factory interface at the rear of the cross-member (the stock location for the earlier trucks)

Many of the kits come with flexible lines that do not fit well. They rub as the wheels are turned. Lowering a truck also changes the location of the wheel calipers. I went through three sets of hoses till I got one that worked. The ones that came in the conversion kit, the factory front hoses and the final working hoses from a 1971-72, 3/4T truck as these are longer than the 1/2T lines.

I also thought I would use the factory interface location at the front of the cross-member and incorporate the factory disc brake line for the later truck. Turned into a cluster as my cross-member didn't have the tabs for the front lines where they connect to the flexible hoses.
So I had to add them. A PITA. I am inducing a picture of the homemade conversion brackets just for fun.

It appears OL SKOOL is using the stock location of the 1968 lines (Rear of the cross-member) to convert to the disc brakes. In hind site that may be the better way to go than moving the lines forward like the factory did.