My '31 Olds uses copper from the fuel pump to the carb. I replaced the original lie because it had chafed against the block. The vacuum line for the wipers is also copper and has a full turn loop between the intake manifold and poit where the line is secured to the firewall. This line is original and shows no sign of fatigue after 75 years of use. So, if you like copper, use it. Just watch where and how you route it.
