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With that LSX motor you will have a tough time finding a set of headers that will work because of the six bolt heads. I know that the Trailblazer ss kooks LT's will not work with the extra tabs on the heads. I was able to put together a pretty stout forged "LS3" for much less than that lsx crate motor will cost you.

I can also tell you that the 2.9 whipple will clear the hood just fine. It sits up high but clears the 67 hood. For injectors I went with ID850's. I have the LS3 C6 whipple so I have the corvette accessories. You'll also need a fuel system to go with that 2.9 whipple.

This stuff really adds up quickly. I guess it all depends on how deep your pockets are.