That build is 12+ years old. Before everyone was doing the LS thing. I bought a wrecked Escalade and took the 6.0 LS2 and 4L80 out For the Camaro. Has LS3 top end. Wasn’t as easy as today. Had to get a custom harness built and 2 or 3 times on the ECM to get it running Just decent. Dyno tune was 430 at the wheels. Haven’t had to touch anything since.