this is an old thread.... but if any1 is still wondering the way to brace it is weld square tubing inside in the REAR from left to right by where the rear armrest's would be, and then in the FRONT under the dash from left to right where the kick panels are,for the SIDES if the doors are unbolted weld in the tubing from front to rear in the door jamb area on both sides, if the doors r still on just weld the tubing to the braces that are on the front and rear. for extra assurance weld an X from the driver front kickpanel area to the pass. rear armrest area and then do the same for the other side.
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 1979 Trans-Am Ls1 project
1972 Chevelle 454
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