Dual points and vaccum switches..

[Jon Pike <jhpike@domain.elided>]

I didn't get any answers on this either..  guess my jack situation was 
too entertaining..  ;-)

I have a (formerly) dual point Marelli dist,  which had some kind of 
vaccum relay/switch that would
change from one point set to the other to give a timing change..  switch 
is missing,  only a single point is installed.  
Car is a 77 Spider,  "California version"  (so sayeth the owners manual)

I'd like to know:

A.  How neccicary is this for proper operation and/or low smog emission?

B.  Where can one find such a vaccum switch?

Thanks...

Jon
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