Just like DavidG said. Take a small drift punch and drive the roll pin toward the air horn enough to get the pump arm off. Then the top will come off. Turn the top 90 degrees to get the rod off on the other side. Allot of people hate the Quadrajet carb. I personally have thrown many a Holly and Carter away and put the QJ in their spot and had great luck. I like them. The small primary makes great low throttle response and as long as you don't set the secondary air doors too loose they transition into those large secondary's nice and smooth without loosing so much manifold vacuum that they stumble during the transition. Just me.