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Get the "correct" one? Correct for what? A 1969 whatever? A 1966 Thunderbird? Since you have a 1969 engine, seems you have already lost "correct". If you want the engine correct for 1966 Thunderbird, first get the correct manifold and carburetor. Also get a fuel pump for a 1966 Thunderbird. Otherwise, get whatever fits and lets it run. I trust you realize that the numbers you found are not part numbers. You should find numbers cast or stamped on the engine block, but that will only tell you the origin of the block - not the engine or the heads
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