Heres my 5.3 4l60e so far. I have $1600 for the engine, trans, harness, ecm, tac module, pedal, starter, fuel rail and injectors from the bone yard. 60K 5.3 from a government truck that was wrecked. about $350 for the 10 bolt 70's camaro rear end install. About another 750 for radiator, 92 blazer fuel tank and high pressure fuel pump, misc for fuel lines, trans lines, radiator, etc. Modified the harness myself and used hop tuners to remove the theft system, set up the ecm and allow me to tune when done. Currently working on the exhaust. ls1 camaro style stock manifolds are the tightest fit I could find. After the exhaust is in I can fire it up. Also not finished but you can check out my photobucket for the progress so far.
http://s960.photobucket.com/albums/ae90/scrambler45/