You should not double flare SS lines, the SS will work harden and split. SS lines are usually single fared with a 37 degree flare as opposed to steel lines which are a 45 degree double flare.
On question #2 I would stick with a dual master cylinder for a 64 to about 72 Corvette. They are available in just about any configuration new for around $70. There is no way I would even consider anything else.
Last edited by 302 Z28; 12-26-2007 at 08:28 AM.