Can I use this brake valve

[Mark B]

I am adding a power booster and new master cylinder to my 4 wheel drum truck. The truck had manual drum brakes and will stay all drums. Can I use the old distribution block (pictured)? My understanding is that since the truck will be still 4 wheel drums, then the old distribution block really does nothing (no proportioning effect), and really only serves to work the brake failure light. I will adding a 10lb residual value downstream on the distribution block on each brake line (one one front line and one on rear line).

thanks very much
Mark