Headers won’t fit in 67 440 dart

Trying to install the headers on my 17 year old son’s car and it’s been fighting me the whole way. This is the second k member we have gotten and painted and it still doesn’t work. What am I missing??

First 3 pics are the first k member wouldn’t clear the steering box. Last 3 pics are the second K member everything clears but went to put on the headers and now they hit the steering box and literally can’t get them on. Losing my patience. I have 3 days off work I want to get this thing on the ground.
Please help.

IMG_1544.jpeg

IMG_1543.jpeg

IMG_1547.jpeg

IMG_1602.jpeg

IMG_1601.jpeg

IMG_1599.jpeg

IMG_1597.jpeg