You will need to weld (spot welded from Ford) some of the body panels like the rear wheel wheels. The B-pillar post will determine the height of the body on the new sub-rails as will the the front cowl section (presume you have the upper body in stock configuration. I would fasten the floor by welding small sections if you don't have a spot welder. I drilled 1/4 inch holes and welded them around the perimeter. Good luck. Send us some photos of your installation.