Stainless steel braided line

Nickle copper lines bend and flare easily. As for 3/16" lines, this tool works great for the tight bend going to the wheel cylinder.
Amazon product ASIN B0027AL3X4Flaring tool at HF work well enough on it.
Deluxe Flaring Tool Kit
or
Double Tube Flaring Tool Kit

I thought our lines were 1/4"? I'm certainly not expert, but I remember reading somewhere that the lines (at least for the '75 Darts/Sports/etc ) were 1/4". Power brakes, disc front, drum rear.