The 3J..... number is the VIN number of the car it came out of.
The "3" indicates that it was a Skylark model.
The "J" indicates that it was a 1963 model.
1961 = "H", 1962 = "I", and 1963 = "J".
The JN... is the motor ID - a 1963 hi-comp engine.
It was the 200 hp engine with 11:1 comp pistons.
dave-TX
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