The model box that fits a first gen camaro is the Saginaw #800.
ID codes are ink stamped on the box with two letters, cast or stamped numbers are of no use for Id other than year of manufacture.
Here is a link to many GM steering box ID codes!
http://www.chevelles.com/techref/shea_3.htmlThere is a date code stamped on the aluminum top cover, it will be in Julian date form. Julian date is a sequential date from 1 to 365 starting from the first day of the year to last day. A box stamped 142-9 would be the 142nd day of 1969. If you look on the internet, you can find Julian calendars.
The piston bore size should be 3 7/8" NOT the big car and pickup 4 1/4".
This info is from
www.pozziracing.com