Brake confusion!

[JWC76]

I'm rebuilding a '69 2x4 SWB for my dad and need some guidance on brake setup.  I've searched this forum but still am confused.  Here's what I have:

'69 PO converted to power disc front at some point using 68-72 spindle/I-beams based on bump stops...  when I disassembled everything for powdercoating, all the brake lines connected to a distribution block mounted to the frame directly behind the steering box.  Truck drove great, no noticable problems with braking prior to disassembly.  

Is this the correct setup?  Should there be a proportioning valve somewhere instead of the "H" style distribution block?  

Today I snagged a proportioning valve and brake lines off of a '74 f100 at a local junk yard.  The valve mounted to the top of the steering box, just below the MC.  

Should I install the proporting valve during the rebuild and discard the frame mounted distribution block?  

Now for brake lines...  I need to order replacements so do I order "74 lines and appropriate flex hoses/calipers or is there a pre '72 year that came from factory with proportioning valve mounted to top of steering box?  In which case the brake lines should match up with my current hoses/calipers...

Hopefully I explained this accurately enough for someone to help.  Thanks!!!