1965-1966 pontiac 2+2 ,bonneville,big cars

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are these cars really bringing big money or what are they really worth say a convertible 2+2 tripower or bonneville convertible 421 either car. are carburetion differences a big deal.and were these cars that popular in the day or not,i"ve always loved big pontiacs,i've found a 1965 bonneville convertible 4spd tripower with air 421 for $38000 is that way to much any info or answers to these question would be greatly appreciated thanks