[Tarrytown SS427s]

Seems like most highway patrol cars were 2 doors back then. There are even pictures of Indiana state police 67 Impala fastbacks! I know New York, Massachusetts, Maine and Ohio definitely used 2 door Biscayne and Bel Airs. Perhaps it sometimes came down to the lowest cost when agencies put their orders out for bid. Many of the 396 cruisers were fitted with a COPO low-compression version of the L35 that ran on regular gasoline.