Correct 70 L78 Carb Return Spring
 

Asking what is the correct carb return spring for a 70 L78 (LS6.?). Ground Up sells a blue one, have no idea if that is actually correct or not.? Seem to have an issue with slightly having to "kick down" the idle speed when stopped, even though there is no choke hooked up (have the crossover blocked on the intake). Therefore, thinking the spring currently on there may not be up to the task.? Any experience with this appreciated.