Quote: Yep, you'll want to get the correct edelbrock adapter.
And, the slot in the kickdown MUST be held against the throttle studs at all times (by that long spring). If you have a gap there right now, that's your problem.
When you push the throttle open, the lever must move immediately with it. The long slot is so if the kickdown linkage binds up, the throttle can still close (before things get exciting ).
When I did my 4bbl conversion I had to extend the linkage about an inch so I had enough adjustment to keep it against the throttle stud.
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