70 C20 disc conversion questions

[Beecee336]

I've read through a bunch of threads but haven't found the answer I'm looking for.
I'm just finishing up the POL 8 lug disc conversion on my 70 longhorn c20. I got a new 73-87 M/C and PV2 prop. valve. I know the rear reservoir of the M/C goes to the front of the prop. valve for the front discs. the original front drum brake plumbing was 1/4" line from distribution block down to T on crossmember then 3/16" lines out to the A arm flex line connection. the new prop. valve has (2) 3/16" line ports for the front brakes.

My question is, will (1) 3/16" line from new Prop. valve down to T at cross member be sufficient to feed both calipers? or should I run (2) new 3/16" line all the way from the prop. valve to each caliper or can I cap 1 port and just use the 1 lower 3/16" port to feed both front brakes?

any help and knowledge is much appreciated