For the basic data plate format, might look in the front of the '56 Chrysler Corp parts book. One place to find them is www.jholst.net.com or www.mymopar.com . Would be in the "INFO" section of the front section of the book, I believe, if it's like the 1960s cars.
Is this a documented "pursuit" vehicle? With the OEM D-500 motor in it? Just curious.
Not sure about where to find production numbers and such.
