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If it is a 65 or 66 engine, you can't possibly tell if it was the original engine. If it is a 67 and up there will be a stamped number on the block that corresponds to your VIN. If they are the same, then the engine is the original engine that came with that car.
Somewhere near the rear of the block, the last six digets of your VIN is supposed to be stamped. Not having owned a 69 Mustang since 1973, I've never looked. There is the casting number and casting date code located above the starter, which needs to be removed to see all that. Let some of the late classic guys tell you 'the where'.
Jim
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original or not
