Did some more homework (should have done it first). I have a B'tchin firewall that is set back 2 3/4" (321040) and a front floor panel (321041). According to the web site this floor panel could be bolted or welded. I think to seal from weather it would be better to weld it which means making collars or some means to gain access to the front body bolts.
Thanks for all the help.