subframe camaro 67-69 vs 70-81

Can somebody tell my the difference between these frames.
I have one underneath my chevy pu '55 and i don't know what year it is.

 

Is the steering box before or after the front crossmember where the engine mounts are? Forward I believe is a later model front steer steering box 70-81 if its before the crossmember I believe its 67-69 rear steer. IDK for sure but Novas have rear steer up to 74. 75-79 have front steer. Front steer clips are stronger I know this from years of dirt track racing.-Weeks

 

Pre 69 steering box is behind the crossmember,70 up in the front,,,

 

Ok,
Thank you!