Auto Transmission Shifting Issue Since 4bbl Upgrade

I agree. I believe that spring is then eliminated with the Lokar setup. I don't know for certain, because I've never used it, but I cannot see where it could be used with the cable.
Here's a link for the instructions that shows the proper set up at the carb showing one spring on page 2.

https://www.lokar.com/assets/instructions/INS0046-ChryslerKickdown.pdf