Keep hearing about frame twist with 440s

got some pictures of how you did that?
i plan on doing my duster with just 3X2 laying on the 3 inch side, but im not sure how close to the fuel lines that would run
Every model will be a little different. Sometimes the parking brake line will need to be routed. 2 x 3 x 3/16 (or so thick) inch tubing welded in. I use a small piece of flat stock welded to the flat end.