power steering pump info for 67 Dart

I'm helping a deceased member's wife make his 67 Dart more usable for her. That includes power steering. The car was switch over to a 340. He had installed a three belt crank pulley and got the right brackets to use with the cast iron water pump. I found a power steering box and the shorter rod for the steering column. I am puzzling over the correct pump to use for this. Was there only one pump used on LAs with cast iron water pump, and if so what is it?