What steering box do I need?

I'm going to be upgrading my 67 Dart to 73 up disc brakes. I have almost everything I need, but am not sure the manual steering gear is going to work. I have the 2537349 box. I only found 2 eBay listings that said it was for 61-74 cars. I found a parts interchange but it only went to 74 and had a different number for manual gear in 73 & 74, p/n 2948812 is what that listed. I have power steering in the car right now and I'm pretty sure the pitman arms are different for power vs manual. If anyone can tell me if this gear is right or wrong, or what part number(s) works, that would be super appreciated. Been going on 7 months of getting the last few pieces to do the swap and would hate to put it in, only to take it out. Thanks in advance.