Reason nobody has messed with 1S or 2S is because the 3S is of the same family - always makes sense to start with the best of any given family. If you were going to play with an M engine, you probably wouldn't do much with a single cam one - unless you wanted to prove you could do it! W box will go into a later Corolla no trouble, so I can't see why it won't go into an earlier one if given a little help from Uncle Sledge.
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