I need help Identifying this cam

The cam came out of a Rebuilt 400 small block Chevy motor
# stamped on the back of the cam is - 275R
also on the back of the cam in white paint is - B25

then farther down some orange paint with cast in # - K and USA
34 1


then farther down the cam - D9

then down more - CWC

then down more - 21

then down more - A2 or A12 not sure on this one

thank you for the help
Ron

the number you need is stamped on the end of the cam