67′ Cuda parking brake question

Can anybody tell me if this is the correct main parking brake cable? I just installed a new left rear parking brake cable and now it seems that my parking brake is on, but it is not, and I cannot get my drum over the shoes. The main parking brake cable adjusting screw is all the way out (see photo) and was wondering if someone knew how long the adjusting screw should be... There is only 2" of adjusting threads on the main cable....

67' Barracuda 8 3/4 rear with 10" brakes... thanks guys.

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