Welcome to the site, lots of help here. You are doing a similar swap as mine, but I will be doing a ls1/t56 swap. As far as the stuff you need, any ls1 or truck pcm should work as long as is from a 5.3 or 6.0(I would check on this though) I believe. The MAF I would use one from a 6.0 truck engine, 02 sensors from a 03 z06 vette(they are longer) for your longtubes. I wouldn't waste my time and money on a ls6 cam, ls6 intake is well worth it compared to aftermarket prices. The t56 is also great and fun to drive and will save you a bunch of fuel compared to a 4 speed.
As far as what else you need I am not sure. Guage conversion for sure, bigger brakes if you dont have some yet, and good suspension is what I am doing as well. You can also give this a try, http://www.ls1tech.com/forums/conversions-hybrids-28/