throttle cable

my throttle cable will not allow my carb to be open wide open throttle. it was a slant 6 car bu has had a 360 swap. i never changed the throttle cable. no matter how i adjust it when sitting in the car and putting the pedal to the floor it only opens the carb 3/4. if i adjust it to where it opens w.o.t then it doesnt travel enough and wont let it close all the way. so im thinking i need a new cable. what are your suggestions? i could go to a junk yard and chance finding a good one. but id rather get a new one that will last. i ddidnt know if a lokar one would be the way to go. any info will help.