Saginaw steering box identification

[DWC]

I recently bought a 68 Camaro and it has a newer steering box already on it.
It's a Saginaw unit with the following casting numbers/letters:
26000525 Z 309 on top of the unit and 25 is cast into the bottom. I believe it's a 2.25 quick ratio unit. Can anyone confirm?

Thanks,

Daniel