1970 Dart police cars????????
I was a member of the Colorado State Patrol during part of the 70's from 74. We ran Plymouth Fury III and Dodge Diplomat all with BB and 727.
Never saw any signs of any A bodies in those days. Most cities, at least here used the state bid process so were using the same type of vehicles till they realized how expensive they were to maintain and the fact they were not city cars.
Lots of good memories from back in those days. At one point our fleet maintenance division threatened to lock out 1st because of red line issues. We ran cars to 100k then and needless to say, we shelled a few.