Looks almost identical to my 10-inch shoes and mounting of my 73... my front shoe (primary) tension springs are the short ones, though... the rest is identical... 8-3/4 '489' rear w/3.23 ratio...
You may have the adjuster cable spring going to the wrong side of the adjuster arm, though... (my spring is on the inside of the arm, with the 'hook' pointing out where it hooks to the arm). No outward pull on the cable 'pulley' on secondary shoe...