Found some rust

To be more clear the pan is spot welded to the firewall and the front pillar along the inner rocker
Panel and to the frame rail. So depending on how much you wanna replace you may or may not cut the spot welds along the firewall and pillar/inner rocker
Most just fit the replacement pan in place then mark around it. Then cut the lines and drill the
spot welds along the frame rails to remove the rusty pan. Pay close attention when cutting across the frame rails as to not cut them.