This is the output:
RM23:
Plymouth Belvedere,Satellite
Medium, Road Runner
2 Door Hardtop

H9G: 383 330HP OR 335HP 1-4BBL 8 CYL
1969 As this car has A/C, it would have the 330 horse engine
St. Louis, MO, USA

291998: Sequence number

E63: 383 cid 4 barrel V8 H.P. 335hp 330 horse
D32: Heavy Duty Automatic Transmission
R4: Bright Red Exterior Color
M6S: Trim - Opt. Decor Group, Vinyl Bucket Seats, Pewter/Black
A4: Silver Metallic Int. Door Frames
618: Build Date: June 18 scheduled production date. may or may not have been the actual assembly date
375869: Order number

A14: Unknown Top Color
C16: Console w/Woodgrain Panel
C55: Bucket Seats
H51: Air Conditioning with Heater
M21: Roof drip rail moldings
M31: Belt Moldings

R11: Radio Solid State AM (2 Watts)
V1W: Unknown white vinyl top.
V21: Performance Hood Treatment
V6W: Longitudinal Stripes, White
26: 26in Radiator
END: End of Sales Codes