1966 Plymouth Barracuda - Commando 273 V8

For the front floor pan, cut the old rusty pan out and lay the new one in place once everything is clean. Clamp it in place, or weight it down from the top, crawl under the car and trace around the sub-frame with a sharpie. This lets you know where to drill holes for your plug welds from pan to sub-frame. The rest is just stitch welding the new to the existing. I believe the correct gauge for the floor is 18.