Not the best picture. From the shop manual for 3/4 ton 54 chevy.
http://chevy.oldcarmanualproject.com/shop/1954truck/54ctsm0514.html
You can just see the "spreader bar" the cable attaches to the lever arm just behind the brake shoe. I think this is very much like the rear brakes for a 67 Chevy 3/4 truck. Might want to measure the diameter of the drum and width of the shoe to be sure.Something like this:
http://67-72chevytrucks.com/vboard/attachment.php?attachmentid=443547&stc=1&d=1237682954
At least you have an idea what goes where.

Steve H