The narrow strip was for different inspectors to punch out as car went past their stations.  They quit using that strip in ’79, I think (but could be wrong.  My wagon has one on it as well.
Your car was passed by inspector 41 and 47 (at least)
J83 – Roof air deflector
M43 – Grill Surround Molding
N98 – Without Lean Burn / With Catalyst
13 – State code (but not sure which state)
619 – not sure
RY3 – Upper Body Paint code – Classic Cream
U 1 – Built to US specifications
G11 – Tinted Glass – All Windows
G52 – Left Outside Mirror, Manual, Chrome
J52 - Hood Release, Inst Panel Mounted
RY3 - Lower Body Paint code – Classic Cream
B2U5 – Interior Trim Code – Defined as:
. B – Price Range
. 2 - All Vinyl Bench Seat
. U5 – Medium color Tan
000 – Interior Paint Code
208 – Vehicle Build Date – February 8, 1978
D66490 (it is a 6) - Vehicle Order Number
E26 – 225 ci 2-bbl
D24 – 4-speed Manual Transmission with Overdrive
NL45 D8B 268311
VIN is as follows
N - Dodge Aspen
L – Low Price Range
45 – 2-seat wagon
D – 225 ci 2-bbl
8 – 1978
B – Hamtramck, MI (assembly plant)
268311 – Sequence Number
BudW