My 6.0 is an LQ4 out of an 04 2500HD, complete from pan to intake with sensors, harness, and ECM. Cost me 1500 shipped. Would have been 1100 without freight, but I could only find longblocks locally. They are rare in the local wrecking yards, and don't last long when they're there. You don't need to be rich, and could do it easily and fairly cheaply. .
If you bide your time and check out the classifieds on a few LS forums, you could pick up a good cam, lifters, pushrods, and intake on the cheap and have an absolute screamer. Just be prepared to buy some tuning software and a wideband and start climbing up that learning curve.
My own project has been put on hold due to funds availability (read: I'm broke) but will recommence very, VERY soon.