Brake question...help!!!

[72RS]

This is a disc/drum question so I hope I am ok posting here... my 72 Camaro has Disc on the front and drum on the back.



I am in the process of installing new drilled and slotted rotors, D52 Wilwood calipers and this master cylinder

http://www.summitracing.com/parts/wil-260-8556p

I have this propotioning valve.


http://www.summitracing.com/parts/rsd-pv71

Wilwood is telling me i need one of these

http://www.summitracing.com/parts/wil-260-3279


Does that sound right?? I thought the prop valve i had did what the residual valve there are telling me i need woul do??

Advise needed please...