'73 road runner, 2 door coupe, 340 V8 240 HP 4V, built in St. Louis, MO.
R = Plymouth Belvedere/Satellite
M = medium price class, Road Runner
21 = body style 2 door coupe
H = 340 V8, 240 HP, one 4V carb
3 = 1973 year model
G = built in St. Louis, MO
229455 = sequence number
CHIP
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