Those should be for the 70-71 as they have the cross over cable for the inner track lock, and I believe they went to the outer track lock only in 72. If yours are original then maybe sometime in 72 was the change over.

416 stroker from Nick at Compu-flow. 11.14 in full street trim. Seems like a new best every time out.
11.06 open headers----so far!!