Power steering pump causing issues?????

This is a strange issue I’ve ran into and I’m Not sure whether it’s power steering box or pump that has created an issue involving the steering wheel wanting to ram all the way to the left when the car it up in blocks and causing the pump to screech and forcing the engine to die. This was a driving car a 1 1/2 years ago and never had this issue. I had converted the /6 to a commando and had to use a different pump. Is it possible that the pump is what’s causing the issue, or the box? Would s Pump from a BB not function correctly since they spin different directions? I’m not sure what the pump came off of but looked correct for years I neede.

I’ve pulled the valve off the top and cleaned it out really good. I’ve tried loosening and tapping the valve up and down but it won’t do anything at all. Any insight would be helpful.

Thanks,