You will have to disconnect the center link on the steering from the pitman arm and inner tie rod end because once installed the steering passes between the tubes. You will also need the car up very high on jack stands to maunver the header in from below on the drivers side. And you will need to unbolt the motor mount on the drivers side so you can jack the motor up and have it rotate to the passenger side to make room to manuver the header in. Or as I did just pull the steering column completely out (6 bolts inside and a roll pin on the stering box) and you have all the room in the world.
The passenger side goes in from above with no clearance issues (do not recall if I removed the oil filter or not).