chassis stiffining

heres the brace my dad did
http://www.cardomain.com/member_pag...ges/2/web/2438000-2438999/2438140_84_full.jpg

and the lower radiator support
http://www.cardomain.com/member_pag...ges/2/web/2438000-2438999/2438140_86_full.jpg
http://www.cardomain.com/member_pag...ges/2/web/2438000-2438999/2438140_87_full.jpg

he did this on his 74 challenger