Aftermarket kick down cables
I think the problem is a Holley 4V has different throttle lever geometry than stock carburetor, and is causing difficulty synchronizing throttle position, and stock throttle pressure rod position.
Using Holley/Chrysler throttle adapter and pivot bolt will correct this imbalance along with a throttle pressure (kick-down) cable.
Below is a 4160 Holley that originally had Ford throttle geometry sitting on a slant six, a Holley adapter was added so Bouchillon cable bracket and KD cable would work correctly. Both throttle cable and kick down cable are infinitely adjustable with this configuration.
I think the problem is a Holley 4V has different throttle lever geometry than stock carburetor, and is causing difficulty synchronizing throttle position, and stock throttle pressure rod position.
Using Holley/Chrysler throttle adapter and pivot bolt will correct this imbalance along with a throttle pressure (kick-down) cable.
Below is a 4160 Holley that originally had Ford throttle geometry sitting on a slant six, a Holley adapter was added so Bouchillon cable bracket and KD cable would work correctly. Both throttle cable and kick down cable are infinitely adjustable with this configuration.