An LS2 is available from GMPartDirect.com, also. They have 400 hp straight out of the crate. They are equipped with the LS6 style heads. The LS2 is not much higher than the LS1 and it comes with a stand-alone type wiring harness that is something like a 4-wire hookup. Add an LS6 intake for about 15 hp more for $400 then add some long tube headers and you're ready to rock.