Trans kickdown linkage (2bl-4bl)

I might have this in the wrong thread, move it if I do.
On a 2 bl to 4 bl swap. The only difference between the linkage is the top rod? I think I remember previously, a friend just made the slot longer and the linkage worked. This is small block I'm talking about. The Cordoba won't sell, so I'm thinking of dropping a carb than maybe headers on it. Anyone have a pic of how they modified thiers? I've got the stock '75 360 2 bl kick down stuff, and it works fine right now.
Thanks guys!
Mike