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You'll have much more fun building your motor than installing the LS9. If that is your goal, do it the custom way.
If you want to keep it as much of a GM product as possible, using the LS9 will make that a reality, although building your own motor gives you the possibility of more power. That being said, the aftermarket is a great resource, sometimes with less reliability than factory products due to sub-par R&D.
If you want to be the fastest car ever, then you may want to consider a lighter car with an engine containing more cylinders by considering the idea of mating 2 GM large-displacement V8s together, upgrading the internals, using 1 turbo per cylinder, and adding so much boost that the power will make a you-shaped impression in the driver seat.
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