[rodkil1]

This is what I got:

Code Description
E55 340-4 Barrel 69-73
D21 Heavy Duty 4-Speed Manual Transmission
JH23 J = Dodge Challenger
H = High
23 = 2 Door Hardtop

H2B H = 340 240HP(net) 1-4BBL 8 CYL
2 = 1972
B = Dodge Main, Hamtramck, MI, USA
505465 Sequence Number '505465'
TB3 Paint Code: Unknown At This Time
B6B5 Trim Grade/Style/Color
B = B Class
6 = Vinyl Bucket Seats
B5 = Medium Blue
000 Upper Door Frame: Full Door Panel
714 Date Built: 7 / 14 / 1972
382839 Order Number: 382839
V1W Roof Type OR Color: Full Vinyl Top - White
U Built to Specifications for USA Order
B51 Power Assisted Brakes
C16 Console w/ Buckets
C56 Bucket Seats 1972 up
G11 Tinted Glass All
G35 Delete Standard Outside Mirror
J25 3 Speed Variable Wipers
J54 Hood Insulating Pad
L25 Trunk Compartment Light
L31 Hood / Fender Mount Turn Signal
M21 Roof Drip Rail Moldings
M42 Front End Molding
N23 Electronic Ignition 72 only
N41 Duel Exhaust w/o Tips
N42 Chrome Duel Exhaust Tips
N95 Nox Exhaust Emission Control
R11 Music Master Radio AM
V7W Accent Stripes - White
EN2 End of Codes Assembly Line 2

Hope this helps. Do you still have the build sheet? It should be under the springs of the back seat.