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Coming into Pontiac, IL, I found several Formulas that looked to be for sale. Also, because Pontiac is part of the Route 66 tourism road, there is a giant Route 66 sign that you can pull your car in front of for pics...
The Pontiac Oakland museum has may be more than a hundred cars in its collection and if you arrange a group tour in advance, they will bus you around to the various warehouses to see the cars that aren't being displayed at the museum(they rotate the cars on a regular basis). The museum has a nice bunch of literature and stuff for the Pontiac enthusiast but is shy of 3rd Gen memorabilia...