That link to the secondaries is 100% Holley. Just remove the link and wire the secondaries shut. I've seen guys not do that and the secondaries open and then don't shut. That will fill your shorts right quick.
I think you're on the right track. Get the primaries divorced from the secondaries and tune them up.
In post 1553 you can see the spring wrapped around the secondary door rod. I'm hoping that it's spring loaded shut and all I have to do is pull the pin and take that little Rod off of each one...