http://www.v8buick.com/showthread.php?282498-1966-Dual-Carbs&p=2332706&highlight=#post2332706 Just passing along. You can thank XPorcelli.
This one works, it's from the '65 shop manual. http://www.v8buick.com/index.php?threads/1966-dual-carbs.282498/
And another one, don't know where this one came from. ***NOTE: the 'trunnion' shown in the pic is the early style. By 1966 they used a different one, a U shaped piece. The early ones were supposedly more likely to bind.