Hi all, This is my first post and first question. I recently bought a 65 A code and just got the engine out. The casting numbers on the block and heads match. It's a 65 289 built in Detroit/Windsor. The car itself was assembled on April 22, 1965 in Dearborn. The date code stamped in the block on the left side of the engine/head surface is (5D15) April 15, 1965, 7 days before the car was assembled. Question...was 7 days enough time to get the assembled engine to the car? Could this be the original engine?