Edlebrock 4 bbv won't open.......
I actually went to Edelbrock's site and was dismayed to find that here are no downloads regarding this carb showing the breakdown of parts THAT I COULD find.
You might download one of the service manuals here at the site, and look up an AVS in the them. I'd try a 69/ 70 service manual, page 14-42, "Checking secondary throttle lock out adjustment."
Here:
http://www.forabodiesonly.com/mopar/showthread.php?t=132309&highlight=manual,+download