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well from looking it up, it appears as though F is for the LA and E is not, but I could be wrong.
You are right, the LA didnt come into play until 67, but there have been stranger things from the factory. Could it be possible that the car was one of the last off the line in 67 and they put the LA in it b/c thats what they had laying around?
I believe if you look on the front of the engine right below where the head meets the block on the drivers side you will see a code stamped into it. also, on the block right below the exhaust is another place (i believe right by the starter).
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