Is the kickdown linkage set up right?

The big difference in hieght is due to the intake. So its not so much 4 bbl vs 2 bbl. When using a lower single plane like a street dominator the '2bbl' setup is pretty good.
Changing the geometry of the adjustable link to the upper bellcrank changes the distance it moves the other two rods.
Oldmanmopar just posted bunch of good photos and description in the post about throttle cables in the Fuel subforum
With a coupling nut. You can adjust the length of the rod to any length you want. Lengthening the rod over comes any geometry issue. No need to complicate the fact by adding in other irrelevant points about brackets, intakes, carbs, etc. None of this matters. Lengthening the rod fixes all of this. It’s that simple.