[RichardJ]

In my first image, taken from the first post above, the flex line WILL WEAR against the upper A-arm, when the spindle moves up/down.

When the caliper is mounted at the rear of the axle center line. the fixed end of the flex line should be mounted forward of the axle center line.

When the flex line is mounted forward of the axle center line, the flex line simply has to flex left or right behind the spindle. When the flex line passes through a vertical line between the upper and lower ball joint, the flex line will not have to loop or stretch out as the spindle articulates left/right or up/down.

Chevy originally mounted the hard lines on the front side of the truck cross member then farther forward onto the frame.

In my opinion, the smart move is to use the Square Body solid front lines that mount on the cross member under the radiator. The combination valve mounts there as well.
Then you can buy the Square Body flex lines across the counter and stop trying to find a non-existent, non-original flex line that almost works.