Uh, I agree with all that you just said, I think. I'd fix the Kadrons, if they're what's broke.
I thought you were suggesting above that we start with just tossing them. For a new build, I'd strongly suggest Webers (or Dels) over Kadrons, but Kadrons are what he's got and has been driving with some degree of comfort.
First though, I'd try a new cap and rotor.