I put stainless steel lines on my Z/28 for legends judging in 2014. I was told no penalties for brake and gas lines. Under the car was fine, the judge under the hood deducted a couple points for the fuel line to the carb?
Classic Tube in Buffalo used the original lines off my car to fine tune the fitment of their lines to the floor pan for a perfect fit. My old lines are probably still hanging in the pattern racks. If there is a leak, the flares were not made correctly.
https://classictube.com/