iirc a guy used no valve at all with 4 wheel discs & it was fine. You could get some short lengths of prefabbed 3/16" brake lines & some double female 3/8-24 connectors at your parts house & bypass it & see how it acts. Not exactly the same but I added '76 A (2.75 bore) discs to the front of my 65 dart & kept the OE splitter & no added prop valve and a dual bowl 1&1/8" alum MC & it worked flawless. It would lockup the rears (10x2 or 2&1/4 (whatever the BBP 7&1/4 is) with hard brakeing but no issue. Ceramic pads in the front. No pad wear that I ever noticed. EDIT the connectors are double female IFF inverted flare female (will have a recessed conical seat on each side of the brass connector)