Keep hearing about frame twist with 440s

Shucks, 2x3” box tube up through the floor would tie that in nice and for damn near nothing. If I didn’t put a new full floor pan in I would have ran them up and through the floor. The USCT fit my AMD pan with very little modification. The picture I am posting is from Mopardude318’s post about 10yrs ago. But it shows the slice and thru method. View attachment 1715502753

I did mine that way , stuck inside the back frame , welded solid all the way , 3/4'' foil faced closed cell styrofoam board is a great filler to make the carpet lay flat, cant tell anything is under there .