Before I changed the carb it wouldn't hardly run. I was gonna rebuild the q jet till I found how bad the shaft holes were and that the choke was broken too. Just not cost effective. The spacer is the one edelbrock recommended. It has the 4 holes that exactly match the holes on the carb then devide off to exactly match the intake. Not the half moon shaped one. I haven't seen one of those in a long time. I had an open adapter at first and it actualy pulled off a little better but idle was much worse. It did get worse I think after the plugs I put in to it. They were a much shorter tip design than the bosche that I pulled out. They were sopposed to be original equipment for it. The number was r43t if anyone knows what is sopposed to go in a heavy duty 1984 350 engine. That wouldn't make that much of a difference though would it? I guess this is gonna turn into another winter project.