Ok. But if you read my initial post, my carb only has two ports: one is full time vacuum, the other is connected to the EGR through a thermalvacuum switch. It seems this port actually doesn't have any vacuum at all as there is nothing at idle, but also nothing when I rev it up. Maybe it only works when under a load? If neither of these are going to work for me, would it be better to have full time vacuum or no vacuum at all?

Thanks for answering