I always make my own lines. On the last several sets I have used the copper Nickel. It comes in all different sizes but for these old Fords I used what Henry used 1/4". It is inexpensive and corrosion resistant and very easy to work with. A 25' roll will do a whole car with some extra left over or in case you make a few mistakes. I use a tubing straightener as well. You can buy it online or from your local parts store. I have purchased both ways although the local parts store was much more expensive but when I told them what I could purchase it for online they matched the price.
Here it is on Amazon
https://www.amazon.com/dp/B015YGR5KM...NsaWNrPXRydWU=