Power to Manual Brake Conversion 73 Duster

From what I'm told, the P valve below will not distribute the fluid correctly.
I have NOT been there done that. But getting there........
I have the correct P valve, but it really doesn't look any different then the drum one I have. I got the P-valve from a good fella that has the same year car as I but just had P/B's.

He went with a total Wilwood system for his ride and off came the stock stuff.