From what I can put together, this version of air pump was only used on 1980 and 1981 models in north america? They switched to a different "puslair" system. The pump is belt driven and located beside the alternator and is connected via a number of 1" rubber hoses both supply and delivery as well as several vacuum lines . There are also a couple of control valve looking things, all controlled via the vacuum lines. There is only one vacuum inlet on the weber and about a half a gazillion on the solex which is tired and in need of a rebuild. The Weber sounds much better and seems to be an instant improvement by the seat dyno. Without the diagram of the vacuum system etc. (apparently this was a sticker under the hood and the original hood is not on the car) I was just guessing at vacuum connections and once the motor came up to temp, somehow oil pressure was being raised in the case and forcing oil into the combustion chambers.
I think I have it sorted. I have disconnected all of the vacuum lines to the control valves, the only vacuum line still in use is the carb to distributor and this now seems to be working. At this point I am going to leave everything in situ and drive it. Then decide whether or not to remove the system.
I have to say, she has cast a spell on me unlike the other cars in the garage. I can't stop thinking about her!
Chris