Yes, after chasing out the old body work at the rear quarter seams for the third time in 13 yerars 1984-1997. “70 swinger 340” I said the next one I do WILL have frame connectors. It does and it is definitely is worth it. Bolt in or weld in either will help. No I would not attempt to weld in with carpet/interior in way to much chance for fire .Good luck…Swingn’