Brake Line Questions

[84GMC15tepside]

Hey everyone, I am new to this forum and joined a few months ago. I have done a lot of reading here and it has definitely been helpful. I haven't posted anything yet but I'll show the work I've done in a new thread sometime soon.

But anyway, I have an 84 GMC Stepside that I have been restoring for the past couple of years. Finally I have been making good progress and got a nice frame that I had sandblasted and painted. I'm in the process of ordering brake lines, fuel lines, and bushings since I have easy access to everything frame related...

Here's some questions I would appreciate being considered:

Where is the factory location of the prop valve?

I think I'm going to order from Inline Tube, and I'm assuming their brake lines are just like factory?

I'm considering the brake booster/master cylinder as a kit from Performance Online. Included is the prop valve but I don't think it's in the factory location. I tried calling the other day but they didn't seem to answer my question. Here's the link: http://www.performanceonline.com/197...ter-Kit-19847/

Not sure if I should just order the proportioning valve separately.

Thanks for reading this, had to get it off my mind.