[ricott]

A 5.3 Trailblazer fuseblock will work (sorry for the confusion). If you can get a 2003-2005 they should be the same. The pickup accelerator petal and throttle body will work - just verify that the intake bolt pattern is the same (older versions -like what you have have 3 bolts while newer versions 2006 or 2007 and up have 4 bolts). Your computer may or may not need an accelerator petal interface (some did some didn't). The only difference between the 4.8/5.3 engine is the stroke (different crank/rods/pistons) The 5.3/5.7/6.0 engines all have the same stroke (crank/rods/pistons) but the bore is different for each of these engines. The 5.3/4.8 electric throttle body is the same - I used 4.8 parts on a 5.3 that I helped a friend wire up and it worked fine.