Question about brake set up!

[6camaro9]

I recently install a baer 4 wheel disc brake kit on my 69 camaro, and now I am getting ready to install a DSE brake booster and new lines. The first question that i have is which kind of brake line do you guys prefer stainless or OEM steel. Second question is do I need to re install the factory prop valve that mounts under the master cylinder. I currently am running the baer adjustable prop valve and the factory prop valve. Baer said to get rid of the factory one and just put a T in front brake lines. This is all new to me so I wanted to get your opinions. Thanks for any Help.

Richard