E body brake pedal ratio

Does anybody know the brake pedal ratio for a 73 e body with manual disc brakes? I don't have access to my car to get a measurement right now. Thanks

Do you mean the 3 pivot/contact points on the brake arm?

Yes. I'm trying to calculate the ratio to help determine the master cylinder size.

This is a 74 E brake pedal.

Thanks alot, I appreciate the picture.

manual pedal ratio around 6:1 and power ratio around 4:1-5:1, depending on application and booster.