Attempting a power brake upgrade

[ncpetersc]

Always intended to do this at some point. Had to replace a rubber line a few weeks ago (swelled and no longer allowed fluid flow). Since I had opened the system, figured I’d look for a kit since I would be bleeding anyway.

Waiting for penetrating fluid to hopefully allow the removal of the rearward line from the prop valve, trying to be patient. The front one cracked loose okay but back one not budging.

While waiting took a look at new valve from the kit. It has an extra port on upper front. Question is: just plug it?

All other ports look the same and look like the same size fittings.

72 disk/drum manual setup from the factory.