Little help with kickdown on Super Six conv

I know this topic has been beat to death.
on my 66 dart with the slant, i changed it over to the Super six and tried the Lokar thing, never could get it right and could not get kickdown
Then I tried the Bouchillon thing, and couldnt get that right, no clearance at the tranny lever, would need to punch in the floor board atleast 3/4in deep and 5 inches long to get it to install.
So I gave that up.
So now I am in about $280.
So today I tried to use the original old school long rod, and I got it all in and set, had an issue with the tranny end of the rod being too long and it wouldnt kick down as it hit the floor board. So I cut it about 3/4 in shorter, now it is shifting right, and I have glorious kickdown.
My question, at the carb connection, I see in a picture I found that there is a spring that connects the rod to the throttle valve rod? What is that for and is it required? I am afraid if I try to use the spring it will pull the rod up, losing pressure on tranny and causing late shifts.
The throttle return spring I understand and I have it connected. It is that other spring that is the question. Help////

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What is sealing the EGR passages off? Or is it just removed for access, threads still have paint so..............??
The spring keeps the linkage from bouncing back & forth, when the adjustments are done, there is always "free play" at low throttle positions before the cam inside the
trans actually starts pressing on the throttle pressure control.