Set the stands more forward where the bumper supports mount to them. First floor pan to swap out would be the transition pan. This is where the rear shock crossmember mounts, rear seat and dangle bracing attaches. You change this pan out first since the trunk floor and main floor pan overlap this pan. If your trunk floor is fucked, trim it back at the seam where it meets the transition pan so you can set the new transition pan in place.
Then peel that main floor pan out. But before you do that, look at my 67 build thread for how I changed out the torsion bar crossmember. I first temp welded some 2" box steel across the front framerails from below the rails, and tack welded it to the bottom of the rockers this keeps the rails square. Then I peeled out the main floor pan.
Fix any rust issues in the rocker panels, weld in a new or used and rust free torsion bar crossmember, then install your new main floor pan. Butt the crossmember to the front framerails if your changing them out, and just temp screw it to the front framerails from the underside with self tapping screws this locates it where it needs to be Ditto with floorplan to front rails. You just zip the self tapping screws back out when you go and change the rails out.
I have seen guys change the whole front stub on these cars with a rust free one. At this point where I mentioned you would be, with new transition pan, torsion bar crossmember, and main floor installed installing an entire front stub would be the easiest way to fix the front clip. A front stub is essentially both frame rails. Inner fender wells upper and lower radiator supports in one unit removed from another car. It slides in place framerails you temp self tap screw to the floorplan, torsion bar crossmember, and inner fender wells to fire wall flanges. Jack and level. Temp install hood, doors fenders, and install bare stripped out K frame to be sure its squared up before welding it on. Dont forget to temp install that K frame. That is critical to framerail spacing. Once your sure its square and ready to weld, wire weld it together.
This part is super important !!!!!!! Once installed you remove your upper radiator support from the old barracuda front clip and weld it into the new clip. It has your VIN partial stamped in it. The last 8 digits stamped in it match your dash vin. If your LH inner fender well has its data plate, remove that as well and reinstall it into the new inner fender well. Dont lose these pieces!!!!!!!!! Too many people lose this stuff all the time.
