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Really, 1987 and up will be. In certain instances, reflashing of the ECM may be required. For a direct swap without reflashing, 97 - 07 for the 350... I believe it's the same for the 305, but I'm not 100% certain. However, if you're changing transmission type (e.g., swapping an engine from a truck with an auto into a truck with a manual, then those parameters will have to be changed.
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