kickdown rod dilemma - throttle not opening fully SOLVED !!!

1)I’m not sure why this is happening but maybe in one of the swaps a lever is off. You know the length got changed. Like the kick down lever on the trans is different and not allowing enough throw or is bottoming out full throw before the throttle is open. Fulcrum angles are key.
2) I had to go to a locar cable for my throtttle pressure on my 66’ when the factory linkage kept giving me issues - very same as your but no slip- just bad shifting points. I am running FI Tech fuel injection so throttle lever is designed more for another brand engine than Chrysler - throttle hole is off and angles were out a tiny bit but enough to cause my issues.
3) If trans is slipping.... I would be dropping the pan and looking for discoloration and bits in the bottom. You may need full pressure to engage clutches like something is off internally I’m sad to say.
Post some pics when you
Can and keep us posted.
Syleng1