Update.
I now have 4 Keihin 42mm carbs and have managed to seperate them and strip each one and on inspection it looks like they have been totally rebuilt to a very good standard, all done with thanks to one of the posters on this thread.
I would like it if someone could give me a part number for the ignition distributer that is not electronic, ie the basic vacuum operated points system one that fits the M110 2.8 engine.
All my googles give me is conversions to electronic systems.

Thanks again for all the input from all you guys.

Andy.