I have a hif44 carb that appears to be a mix between a standard carb and a turbo carb but I cannot tell which one it is meant to be. It does not have the groove at the top of the dashpot but I understand that they are not mandatory and it does appear to have a seal in between the dashpot and the body. There is also a connector for a pipe on the part that connects to the manifold and I have only ever seen these on turbo carbs but maybe they were used on n/a carbs too. Any idea what it is for? I have heard the term balance pipe but where exactly should it connect?. Finally the throttle and choke cams are usually found on the opposite side for turbo carbs but perhaps this could be a carb that somebody has previously converted to turbo spec.
Any help is much appreciated.
Here are some pictures:














