I'm Sorry, but I'm still confused about Power Brakes?

[jorgensensc]

I have manual brakes on my '68 now, with a wilwood adjustable proportioning valve since the front brakes have been converted to late model disc brakes.

I picked up a power drum brake setup off of a '67 c20 (dual diaphragm)with brackets.

It doesn't have a prop valve, but a distribution block since the truck came with drums all around, no need for the distribution block.

Now if I go to the parts store and get a master cylinder for a '71-'72 (for disc brakes) will it mount to the booster that I have? Or is there something funny about the rod inside the booster?

If it will work, do I need a traditional proportioning valve, or can I use my adjustable Wilwood Proportioning valve in place of the traditional style?

If someone tried to explain this to me before and i didn't understand, I apologize. For some reason even the search topics don't really explain it to me well enough. Just call me Box of Rocks! Thanks ahead of time!
Shawn