B body applies to 60's-70's full size Pontiacs, Chevys are also b bodies but not all parts are interchangeble. Pontiac used differant suspension and frame than Chevy. Not until 71 did GM use the same brakes and suspension throughout the full size cars.
The retaper on the tie rod is how they hook up to the steering knuckles. Some mount from the top, some the bottom. To help with bumpsteer, the tie rod assembly needs to be as close to the same angle as the lower control arm.
The Scarebird brackets come with instructions for what parts you needs to buy. Mine is an older kit, I have to machine down the o.d. of the brake hub enough to mount a rear 77-79 Seviller rear rotor and use a GM intermediate caliper.