Shorty header install

Well folks. I've decided to use these cheap Hedman headers I have and the driver side looks like a PITA due to the intermediate shaft and great box being in the way. Would it be easier to disconnect the shaft from the steering box and by doing so, will it give me enough clearance to remove the old manifold and install the header in that side? Or will I have to unbolt the gear box from the car? I've got a 65 Dart with 273. Additionally, does anyone have instructions on how to remove the shaft from the gear box?