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Something everyone should keep in mind is that the H22 and H23 are very very different blocks. Externally they are very similar (enough to swap easy). The H23 lacks the oil squirters that the H22 has, probably the cause of the infant mortality that H23/VTEC conversions have. I have yet to hear of anyone doing this and getting more than 10 or 15k miles out of the engine (if anyone's out there, please come forward). You should also keep in mind that the rod/stroke ratio on the H23 is down around 1.5, pretty bad. It makes for a torquey stroker motor, but makes it less free-revving.
All that in mind, if you do *anything* to the H23, even if you balance, etc., I wouldn't raise the stock rev limit. That extra torqu comes at a cost. If you want more power, go with a complete H22 (will end up being cheaper/easier than a head swap), and if you want more torque, sell your car and buy a 5.0 Mustang.
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