Master cylinder identification
 

Casting number 5452310 date code B 10 8 , CH letter stamp on the pad , very faint and hard to read.. no bleeder screws on it. small stamp , tiny number 588 on the face of the front brake line boss. I cant find any chart for that CH ID stamp , I was told it was on a GTO when I got it . Anyone have any books on that 2 letter stamp? CT is a Camaro code but that second letter is not a T.