1968 Dart Proportioning Valve Plumbing? Which lines go where?

PinkGT said

Or is it that all the warning lamp switches also serve as proportioning valves in some capacity? Can anybody clear up my confusion on this one?
Thanks in advance..

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My OE distribution block on my 68 Barracuda is as you mentioned a distribution block that also houses an sensor that lights a dash lamp if the front to rear line pressure differs significantly. My car was a 4 wheel drum car. The block has no proportioning action at all.
When I switched to 4 wheel disks, the mopar 73 and up disks in the front and a Dr Diff disk kit in the rear, Cass ( Dr Diff) said to keep the OE distribution block as it was originally. I did and the brakes are fine. I know my set up is a little different than yours, but this is an example where the OE block works fine.