Another proportioning valve question

[Square_78]

Ok here's the story. I have a 1970 gmc with drum drum. I have a complete front disc brake drop spindle kit from CPP with master and booster and adj proportioning valve already assembled as one unit. I also have 4 new ball joints and tie rod ends to install. I don't have my own shop so I need to do this in two stages. I can only use my friends shop on Sundays and I don't see myself being able to do it all in one day. Is it possible for me to install my new booster and master and disc/drum proportioning valve package and run it on the existing drum drum brakes for a couple days back and forth to the shop? Could I just open up the adjustable prop valve so its running equal pressure. I just don't think I can install everything in one day. Reason is I am using my buddy's shop and can only work on Sundays. I figure if I do the booster and master and prop valve and any new brake lines one day and then I can do the balljoints, spindles and tie rods and install the discs and calipers the next Sunday? I can't leave the truck at the shop either. I have to be able to take it back to my place until the next weekend. Ya it's inconvenient but its all I've got to work with.

Will the cpp disc/drum master and prop valve work with my drum/drum brakes temporarily?

This is frustrating the hell out of my trying to figure out How to get this all done

Cheers
Lonnie.
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