high Idle 318

looking at both carbs in post #6 and the carb in post #11 there is a huge difference in the amount the idle screws are turned. Mine (post #6) works great OP doesn't. Also OP stated in post #15 that is fast idle cam does not return to full clockwise on its own which is what OP was eluding to in his original posts.
Yours looks right for an early-A
His looks right for a 73 up with retarded timing, and especially with a non-functional, or poorly functioning, PCV.
And it is clear to see in his photos that the choke flapper is wide open, with the fast-idle partially engaged. What we don't know is if the fast-idle cam is stuck on it's pivot, or if the spring is not retracting. For the latter there are several reasons; no electricity from the #1 splice, no intake heat from the crossover,a failed choke bi-metallic spring, or a mechanical snag/mislocated link-rod under the little metal cover.
I suppose it could even be that the KD mech is holding it open