When the Floor Pans are positioned correctly (i.e. stock position) are they sit on and tack welded to the Floor Braces? Reason that I ask is that my 77 has replacement Floor Pans (the are not the factory look-alikes you can get from one of the parts warehouses) and there is a gap of about 1" between the pans and the braces. Does this compromise the integrity and/or strength of the body/floor?