The B7300 does not have the block (connections for the PS), because none of those models had PS.
It would take some serious rework to add PS to your tractor, it wouldn't be a simple plug and play.
#1: You would have to add the proportional valve to the hydraulics be able to run both the three point and the PS.
#2: You would have to change the entire steering box, support and column as it's shorter than the one you have now.
#3: You might or might not have to change the pitman arm and the drag link.