I would think that the engine code is C9F

Cant find it but the Cxx codes were generally used in the late
seventies .......some camaro Cxx were in 1980. There is not a
good all encompasing web site with every letter code. Used to be, the Chevy parts manual had a letter code reference but paper parts books went long ago

By the way, you should pull a valve cover and find if they snuck in some of those "high performance 305" heads in on you.......folks are raving about the performance of those!!!!

If I find the code, I'll post a reply