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If you can't find any play at the ball joint, it's in good shape. If there is play, you can either replace the ball joint for optimum performance or measure the amount to see if it's within spec by mounting a dial indicator on the lower control arm, placing its plunger vertically on the spindle (knuckle) ,and retesting with the prybar. The spec for a '65-'69 Tempest, LeMans, and GTO lower ball joint is 0.050-inch vertical movement before replacement is needed. Horizontal movement is not measured with this ball joint, but may be for other models.
Here is a detailed diagram of typical Pontiac steering components from the era. This appears to be a rear steer configuration as used on '67-'69 Firebirds and '71-'74 Venturas. The A-bodies and 70 1/2-'81 F-bodies use a front steer setup that places the steering box and linkage ahead of the hubs.