904 goes out, 833 goes in, I think?
I did my conversion last year on a 74 Duster. Here are some pics. I placed the hump on the trans tunnel and found that it only fits one way and dictates where it goes. I then drew an outline around the outside of the hump with a Sharpie. Then I cut 1/2 inside of that line. There are a few spot welds to undo as well on top of the T bar crossmember.