Brian, your explanation makes sense, but I can say I have had my pcv hooked up to that port w/ the power brakes (tee'd off) for years, and I have no issues that I can tell. Anyhow, Tcodi, the two small vacuum connections on the front or sides of the carb are full time vacuum and ported vacuum...the full time is the one in the base plate, or nearer the bottom of the carb...the ported works with the throttle, and varies with engine speed...either will hook up to the vacuum canister on the distributor, and there are many arguments about which to use...you will hear both arguments. I use the full time, but I tell people to try both and see which works better in your particular application. And yes, you can hook the pcv up to the threaded connection in the intake. The divider in the intake plenum is cut down to make if work a little more like a single plane intake. That is sometimes done by hot rodders...it lets the air/fuel mixture cross over to the other intake ports without following the runners as directly. It's supposed to make the dual plane a little more high RPM friendly. But with todays intakes, they work pretty well as manufactured. It's an old fashioned way of modifying something, like drilling the throttle plates in a carb so it will idle with a bigger cam. If your intake has a divider in it at all, it is a dual plane...an single plane is all open inside. John