360/727 cooler lines.

What I would do........ Get yourself a 25 ft roll of cupro/nickle tubing,( i think you need 5/16)and make your own lines. This type of tubing is easy to bend, and flare (using a quality flare tool). It has a slight copper look to it.
I buy cupro/nickle tubing from ebay, with free shipping. Most newer vehicles are using this type of tubing. It will not rust, and is DOT approved. Been in use in Europe for a long time. It's the only kind I use any more.
Then you can save your SS lines for your next project.