With a 5 19 69 cast date the motor likely came out of a 70 or 71 model car.....the confusing part is the 7 in front of the GXXXXXX. That would have to be a typo.
70 Road Runner 383-4 4 speed FJ5 & black guts 70 Charger R/T 440-4 4 speed FJ5 & white guts
