Brake Proportioning Valve Question?

Gals, Guys...

Putting the Rear in today, and realized that I'm going 4 wheel Disc. So, since the car originally had Drum brakes on all Four wheels, I'm assuming the old prop valve balanced at 50/50, and residual pressure all the way around. Would this valve now provide the same behavior for the Discs?

Don't see ripping out the value if I don't have to :)

Thanks