904 shifting strange

OK so I adjusted the kickdown linkage per the instructions and it still shifts funny, a little better from 2nd into 3rd but still wont downshift if I mash the gas... so I'm thinking that the throttle is not opening all of the way when the pedal is fully depressed.. and the cable sleeve is adjusted all of the way back.. how do I adjust it further? bend the bracket? bend the gas pedal or something else. Oh it is a 73 225 with a carter bbd from a 78/9 volare (complete with linkage and brackets. )