carb adjustment

i have a edlebrock 600 or 650 cfm 4 barrel on my 73 360 duster, and just cant get 4 barrel to kick in, i give it full throttle 4 barrel lever moves but butterflies wont open, i see a type of spring next to lever is that the adjustment to open it or does anybody have any ideas, frustrating when you want to kick it down. also cant get passing gear to kick down it has aftermarket lokar on it and when i adjust it it just changes shift pattern, any help would be thankful