Sounds like i just need to hillbilly hotrod up a spring then, because i don't have the factory kickdown linkage or carburetor/intake, ive got a lokar cable and eldelbrock carb with aftermarket styled brackets ext.
With the locar stuff you can put a light spring from the lever to your cooler line.
I used a small section of 5/16 vacuum line around the cooler line to protect it.
The throttle pressure valve does have a spring inside the valve body under the valve, but that only partially returns the lever.
The added spring on the lever itself solves that.