Hi. I'm looking to buy a 63 Impala 409/425. The engine numbers are: T1111QP, casting #3844422, date code on right rear 273. The vin is 31847J161886 confirming that it is a 63. The engine code indicates that it was used in 64 and that it had transistor ignition. Is there any chance that this engine came in this car from the factory? I'm thinking not. Thanks.