i would look for a 5.3 or 6.0 iron ls series engine, the ls2 is a great motor its all aluminum so $$ the iron 6.0 is just as good and alot cheaper. at our local unkyards a core 4.8-5.3-60 is around 200-250 dollars! or a complete runner for around 6-800 or an entire swap trans harness ECU for about 1300-1500!!!!!!!!!!!!!!!