So on this model there is the v.tank and the bell behind the engine block, each would go to one of the two steel nipple on the firewall, one smaller one larger
inside the car two little air tanks in each footwell, a larger one on top of the heater unit and a complex series of junctions out of the control dial. and then lots of worn pipe
is there a crudely simple 'map' diagram anyone has that shows the flow? there are a number of plastic T junction connectors too, about 5 of them.


the wall


 

Here is a diagram of the vacuum system behind the dash. Rather complex!

 

Is that a Delanaire II diagram, Andy?

 

Actually that diagram was for non-AC cars.
Here is the one for AC cars (Delanaire-II):

 

mine's a simple air flow and heater set up.