Secondary linkage - edelbrock AVS
Well, I would not have messed with the linkage. You got balls.
The air door can be opened up as early as the engine can handle it, to the point of bog or performance falls off.
If you nail it and it bogs down....to far.
If you take it to the track and open it up earlier and performance falls off, IE slower times...you have gone to far.
Best "ROAR" is heard from a T-Q. Open air cleaner. And made more pernouced with a high ratio because the roar or I should say the draw of air is larger and moving quicker due to the higher gear turning more. And quickly.