i emailed AMD about it and this is what they said:
received your email about the duster floor installation and the issue you are having with the installation.
I looked at the photos and I have had a similar issues with a MOPAR floorpan installations. I found that the firewall must be the last item clamped so the floor can be pushed down all the way and secured to the crossmember. The floor only needs to weld on the horizontal surfaces of the cross member, if you look at the crossmember you will see where the original welds were. Pulling the firewall and floor together will be tough because once the floor is removed the firewall tends to move forward at the bottom. Also MOPAR’s are many times mig welded at this floor to firewall flange because the fitment was so poor here during production and the spot welder would not work on these short flanges. Let me know if this helps you out or if you need any more information with this one. Also feel free to call if you would like,
