Brake proportioning valve question

[crewsr]

The braking in my 71 C10 is pretty poor. It's disk/drum, no power assist. I have within recent memory installed new MC, calipers/cylinders, disks/drums etc. The prop valve currently on the truck has 2 in and 2 out and no bleed 'button'; I'm not really sure if it's the correct one for disk/drum (previous owner mentioned that he had converted the fronts to disk, but I don't really have any details). I've purchased a new prop valve which is 2 in and 3 out; there are separate outputs for the each front wheel. Without changing my brake lines what should I do with the extra port? I've seen some pictures of others with the same (or similar) brake lines where there's a 3/8-24 brass bolt screwed in to this port (the new prop valve did not come with one). I've also seen some pictures where a 't' and some short sections of brake line are used to merge these two and connect them both to the existing front line. I'd prefer the first option as it looks much cleaner; is there anything special about the bolt for this? Is it safe to just get one at the hardware store and use thread tape?