Mike,
most will be numbered PKxxxxxxx xxxx xxxx
PK is the factory PK= Kokomo
first 6 XXXXXXX = Part number
next 4 XXXX = 10k date code - 1465 - 1829 is 66, 1830 - 2194 is 67
last 4 XXXX = number built that day
print this out might be easiest to take with you.
http://www.mymopar.com/downloads/transguide.pdf