I have gotten hold of a Ls 5.3 to put in my 94 truck that now has a 5.7.I believe that the 5.3 is only 285 hp stock so I will need to add some hp to move my bigg truck !!! I will be swapping in a Ls6 intake,new oil pump and pan(truck is lowered),headers,springs,hardened rods,ported heads,gasket set and a cam.Will I be able with these changes and a tune to hit around 400 hp !!!Not quite sure which cam to get yet--was leaning towards the XR265hr but I hear that is is only a few steps up from stock. Not that I want to go crasy but want something that I can notice and feel(hear too) !!! Any recomendations !! Thanks and what an awesome site !!! Great reading in here and a wealth of knowledge too !!!