Yeah I had to retune. It helps to have someone show you the basics, which Jesse did for me. After you kinda get the hang of things, you can start searching and posting on the HP Tuners Forums for more advanced or specific stuff. Jesse is cool; I picked up a friend out of the deal too. He was just over this weekend helping me work on my cam swap. But, if you can't find someone close to you to help you get started, I highly recommend going to the library or the bookstore and picking up Greg Banish's Advanced EFI Tuning book. It will walk you through everything.
The swap changed my inlet routing, and thus threw off the MAF readings. The LS6 intake increased the Volumetric Efficiency by about 12% at the torque peak, but only about 5% near the redline because the cam was running out of steam. Good thing I just fixed that.... more to come.