Correct placement of proportion valve on '69 C20 front disc swap

[tdangle]

I have a kit ordered for my 70 C20, but didn't buy the master cylinder/pv/booster they offered because it doesn't seem to be correct for the C20. In my research 71,72 C20's used a dual chamber 11" booster and master cylinder with a 1 1/4" bore. The rear portion of the m/c goes to the front discs and has a larger fluid capacity. the front goes to the rear brakes. This is opposite of a C10. From what I could tell the proportioning valve is the same for both C10 and C20 in years 71,72.