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Modified is more 'anything goes' than Prepared... I believe Prepared still requires factory head and block castings with certain exceptions. Prepared cars are still sedan-based, also (many Modified class cars are open wheel racers).
But noone here is going to be running in those classes so I'm not sure why I bothered to type that... A 240SX has its best hope of competing in STS or DSP.
Street Prepared doesn't really allow internal mods, either, but beyond STS it does allow modifying the intake tract up to the head ports. Of course since noone makes aftermarket intake manifolds for the KA, and there isn't much if any power to be seen by adding one to an internally stock engine anyway...
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