Copper nickel is a good (much better I think) and easy to work with alternative to stainless, and most anything is much better in the long run than plain copper, as mentioned above.

I've used a lot of copper nickel line on my truck, here's some info
https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=669101#Post669101

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-