identify the year of my 360 long block

From an old NADA booklet, I'd say it is a 360 HP motor for a 1980 car. It was available in a Chrysler Cordoba '300', a Dodge Mirada, or a Dodge St. Regis. And likely in police cars. A 360 HP motor was rated at 185 HP. I think it was the last year that Chrysler put a 360 in a car.