There is 3 bolts and the hose lines which need to be removed after removing fan belt
Installing power steering requires purchasing a new steering rack, pump, and lines. The system has to have a power steering capable rack installed, the reservoir and lines need to be placed comfortably in the engine bay. After installation the system will need to the bled.
You can convert manual to power steering on a 1969 Camaro. the steering box will need to be changed, and a pump and brackets as well as fluid lines will need to be added.
You NEED to replace the rack and pinion steering unit.
you might need to replace the steering rack
you will need a power steering pulley puller other than that its gravy
You will need to remove the belt from your power steering pump. Remove the power steering hose. Remove the power steering retaining bolts. Reverse the process to install your new power steering pump.
The squealing could be that you need to add power steering fluid. Also you should check the belt that operates the power steering pump, if bad replace it. If the power steering pump is full and the belt is ok, then you may need to replace the power steering pump.
It's built into the power steering reservoir. To replace it you need to replace the whole reservoir. Fortunately, this is an inexpensive part... ($30).
You need to replace the power steering pump. If it is leaking, it is going out.
Replace the whole rack, it would take speical tools to replace seals
you will need a power steering seal replace.