'68 GMC 3/4 Ton Disc Conversion

[Droff]

I'm close to what I thought was getting my truck swapped over to front disc. I bought some '86 3/4 ton brake parts and mostly used just the spindles and control arms, everything else is new - rotors, calipers, booster and MC as well as ball joints, bushings, springs and steering parts.
I decided to replace the rear brake line because the flare nut wouldn't thread into my new prop valve. It's the line that runs from the prop valve to a union along the frame. It's a 1/4" line and one end looks to be 9/16"-18 and the other is 7/16"-24. In researching what those sizes were I ran across more MC discussion.
I have a 3/4 ton and the discussion was prop valve and MC connections and sizes. Basically, I'm now not sure I have what I should have concerning the prop valve and MC.
I picked these up a while back..

Booster and MC;
https://www.summitracing.com/parts/sum-760207

Prop valve;
https://www.summitracing.com/parts/clp-pvks-2

I don't plan on any towing, at least nothing on a regular basis and there won't be much hauling.
Am I installing the correct or incorrect parts?

Thanks.