No, that’s not how they all work. All the factory stuff for these cars is intended for use with a disk/drum set up. How it’s balanced and proportioned was intended to keep the disks and drums, which take different amounts of time to apply, working in unison.
If you’ve gone to aftermarket brakes, 4 wheel disks etc then adding an adjustable valve is the only way you’re going to get the front and rear balance set properly for your car. Maybe running with the factory distribution block or prop valve will get you close enough for most braking situations, or maybe you’ll get lucky and it’ll be right. But that’s unlikely, especially when you start mixing and matching aftermarket set ups.
