Kinglonestar,
I would add to the positive opinions about copper nickel brake line. I had never done brake lines before I restored my 1950 COE. I replaced all lines, as well as the fuel line, and never had a failed flare or leak. You need a quality flare tool, but the alloy is more malleable than mild steel and easier to work with. I have never worked with stainless steel but I understand it is more brittle and it is easier to have cracked flares.

NAPA now carries it, although they won't likely have it in stock and will have to order it for you. It costs at least twice what regular steel line costs, but well worth it.

Kent

1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix