I can name countless 5.3's that have lived very long lives at 700-800rwhp straight out of a junkyard. LS motors are CHEAP to go "fast" in. But once you pass the "fast" threshold into 1krwhp cars they are just as expensive as any other car. However, a turbo junkyard 5.3 fox with 10k in it will run circles around an 03 Cobra with 10k in it.Yes stick a cheap turbo on a junkyard LS will make power.will it last? Nope.
Broke asses do LS swaps...