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The stock LT1 PCM was never designed to handle boost. There are two ways to back-door it, but you have to know what you're doing. The other thing is that it opens up the tuning window to HP Tuners and guys familiar with that. Although these Gen2 LT1s need more advance than LS motors so a tuner who doesn't understand that will leave a lot of power on the table.
 

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24x can be done cheaper than the TorqueHead kit if you're not afraid of wiring and junk yard parts and with my very aggressive cam the 0411 PCM has some additional parameters such as dwell which allowed me to achieve much smoother operation at low throttle low speed conditions.

-Brian
Don't you lose sequential injector control with the 4x crank-only conversion, which then precludes your ability to delay injector timing until after exhaust valve close at idle?
 
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