300
In 1966, Chevrolet produced approximately 12,000 Impala convertibles. This model was part of the popular Impala line, which was known for its style and performance during the mid-1960s. The Impala convertible continues to be a sought-after classic car among collectors today.
5x4.75
66 Impala bolt pattern is 5X4 3/4
55989
2007 Chevy Impala SS production: 11,456 units
The answer to this is not as easy as giving a price due to there being many models of 1966 Chevy Impala's. There are sedans, station wagons, and hardtop coupes. So in order to give a proper answer more details on the vehicle would be needed.
It has a full perimeter frame.
Very carefully
10000000000 bucks
http://www.nadaguides.com/Classic-Cars
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Chevrolet Motor Division recorded the production of 185,325 Impala Super Sport models in 1964.