Self-centering (or lack thereof) in park and camber / caster / toe settings

Let's say that you've just completely replaced the front end (in my case the front stub) and rebuilt everything, new bushings, ball joints, tie rod ends, etc. You've bolted all these nice new or cleaned up parts to the frame. Reinstalled the previously-correctly-working steering gear. Re-mounted the engine/transmission. Reconnected the steering column. You've adjusted the torsion bars to set the ride height, you've adjusted the tie-rod sleeves and eye-balled the tires so they look parallel and are pointing straight. You've tightened the upper control arm bolts at their center positions.

You'll do a proper alignment later. You just want to move the car around the driveway / garage for now. And this is a power steering setup. All original 1967.

The wheels are pointing straight ahead, you start the engine, and the steering wheel start to turn and goes full / hard right. You can stop it if you hold the wheel, takes practically no effort to stop it, but if you don't, it always wants to turn full right, not very fast. And you're not moving, this is while in park.

Is this a steering gear valve body adjustment issue, or a camber/caster/toe issue?