Most people use falcon XR 1967 to falcon XF 1987 ,67 to XY 71 had manual box or power ram like early mustangs . 1972 manual box or power steering box .Also early 67 /71 power ram boxs had 16 to 1 ratio ,manual boxs had 20 to 1 box ,16 to 1 is good for racing . Getting very had to buy but someone will have one .You will need drag link modified etc ,rhd pitman arm also . cheers Glenn . ps can you use a rack .