MACH I Member
Joined: Nov 2006
Did you install temporary bracing to keep things in place before you started removing structural components? If not, that's where the problem starts. Did you take any reference measurements?
About all that you can do if you didn't is to find another 68 and take measurements and try to replicate them as best that you can. Your biggest concern is going to be door fitment. It may be that the new torque box is slightly off, too. Do you have what's left of the old one to compare?