Keep hearing about frame twist with 440s

barbee6043 said

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.

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This subject should show a lot of info if the OP does a search. Basically I look at the sub frame connectors as two main types, both welded. One goes into the floor pan and all is welded pan and all. The other the connector will sit just below the pan. Like said, there an be a little difference between car models somewhat.
When a person adds all the various stiffening pieces he changes the car quite a bit. The next owner may not care for such. Seems my cars always eventually find a new home.