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The prop valve isn't your problem. You had done nothing hydroulicly, so there is no reason for it to be the problem.
Jack up the rear. Supprot safely. Remove one or both rear wheels. Remove drum.
Look at the little star gear thingy at about the 6 o'clock position. Are the teeth shill there? Move the little lever down to strike the gear, does it make contact? If not, replase the gear. (that is your adjuster and assosiated parts)
If it is all good, then look at your drum, there should either be an access hole, or a blank that is ready to be knocked out. Install the drum after ensuring the hole is free.
Position the drum (by spinning rear axle if you have too) to where you can see the gear. Useing a lang flat head screwdriver, reach in and spin that gear the same way that lever would have spun it. That will tighten up your clearance. Do not tighten it to the point that there is shoe contact with the drum. (more likely than not, there will be a lot of spinning on that little gear)
Go to the other side and repeat.
Once the tires are on and tightened, drive down the street (or open lot) in reverse pumping the brakes. Eash time you hit the brakes, it adjusts just a little, but will not over adjust. You should feel the pedal get firmer, and have less travel.
Go and lock up your tires, try it in gravel if you like, but they will skid on pavement now.
99.99% chance this is your problem. It is the #1 problem after doing drum brakes. Many people think the self adjusters will do huge adjustments, but in reality, it is for very fine increases in adjustment only.
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