Distribution block and adjustable prop valve

69 Valiant originally 4 drums, now 73 A body ft disc’s,rear 11 in drums.
Can I run all lines to the original distribution block then cut the line going to rear brakes on the frame rail, then install a adjustable prop valve? Or do I bypass the block and add prop valve right off master cylinder line going to rear?
I have nearLy the same setup and set, cut my prop valve in after the D block and mounted it to the frame rail just like you’re asking. My prop valve adjustment is wide open for best front/rear braking. I bet it would work either way but I wanted to keep my D block in place. Good luck. Brian.