1984 GMC Power Steering Pump Removal

[Junior127]

I just purchased a 1984 GMC 3/4 ton with a 350 crate motor and I'm having trouble removing the power steering pump. I am trying to remove the bracket that holds the pump with the pump on it. There is a bolt towards the center of the motor between the water pump and power steering pump that I am unable to get at to loosen. This is not allowing me to loosen the power steering belt or remove the power steering pump.

Is there a trick to loosen the last bolt to remove the bracket? I can't seem to get a wrench or a socket in there and there is not a window in the pulley to go through.

I have attached a couple pics to give an idea of what I'm looking at.

Thanks for any suggestions.