Congragulation! That is going to be really sweet with an LQ9. I don't know anything about bolting the LQ9 to the 5 speed, but I can tell you not to waste your $$ on that MAF and Throttle Body Spacer. You $$ will be much better spent with a tune. Not to mention that the tune will grow with you. As you make more and more changes the tune can be upgraded.
No more trucks, but this is what I used to have. 2000 GMC Sierra, 6.0L-LQ4, Built 4L60, LS6 Cam, The Other Guys Headers, 3 inch exhaust and 7 chamber flowmaster, 43lb injectors, Nelson Tuning, Drop - 3/4 McGaughys Spindles, Bell Tech Shackles & Hangers. Best time 13.59 @ 106