Just found your club a few days ago. I own a 1967 and a 1969 Pontiac Bonneville Ambulances manufactured by Superior Coach.
Both ambulance chassis were built at the Pontiac plant in Pontiac Michigan and were converted as ambulances at Superiorí* plant in Kosciusko, Mississippi.
The 67 was purchased by Atomic Energy of Canada Ltd, Chalk River Plant in March of 67 and stayed in service there for almost 20 years. The 69 was originally purchased by the town of Rivers in Manitoba before making its way for the St. Stephen Ambulance Service where it was retired in the late 80s.
Looking forward to learn more about tips and tricks on the restoration on both Bonneville.
You can see pictures of the cars at Flickr: pontiacambulance'* Photostream
Also clips at YouTube - pontiacambulance'* Channel