Front Break Line Pressure

[Endangered Species]

What is the ideal front Break Line Pressure for a Mid 60's Nostalgia S/S car.
Right now mine is 550 on the right and 600 on the left. Not sure what the ideal pressure on the front should be. I didn't play around with the proportioning valve yet because I'm not sure what PSI I want on the front.

Thanks

 

[493 Mike]

You can't have different pressures from one port on the master cylinder. Pressure output from the master cylinder is dependent on how much pressure you apply to the pedal.
Mike