69 Impala SS master cylinder?

[z28s4mjg]

Hello,
I am trying to help a friend figure out what the correct master cylinder and stamped code is for a 1969 Impala SS 427 with J52 brakes. If it matters it is a car built 09 D of 1968.
Thanks,
Mike

[galveston]

The correct stamped code would be "CE" for power disc.

[z28s4mjg]

Thanks!
Do you know the casting number. Seems to be some discussion about whether it is the 309 or the deep master cylinder.
Mike