this is not a 68-72 A body.
nor a nova,
nor a camaro.
i would guess its a metric monte clip.
the reason i say its not either of these is for the fact that the frame drops significantly after the rear lower control arm mount. yours does not.
are the bolts standard or metric?
i vote X body. even tho your pitman arm says different, i would not go off 1 part that may be interchangable.