GM at that time, produced what they called a Police and Taxi Package. This included heavier suspension and huge brakes. There were engine options for them as well but it wasn't well known that you could order the "Interceptor" engine package. I do know that it was available in the Concours. That engine came with a different cam, a re-jetted 4bbl carb and higher compression. The car was small and light and hauled the freight !!! The guys in patrol loved them but in the long run they were too small to use as Black and Whites. The drivers side arm rests kept getting torn off because the drivers were storing their batons in the grab handles. When they started putting computers in the cars, that ended the medium size cars for Patrol use. I have a friend that just sold his Nova last year with 400K on it. It was a junk pile but never had the heads off all that time...........Bruce