Yea, that itch has been bugging me for quite awhile. Let'* just hope I can actually start it. Unlike the last itch that'* sitting down in the basement(Ported/Polished supercharger for the Bonneville). Friggin 6n1 work schedule.
it may be slightly more difficult at first, the only problem i can think of is adapting the metal line to the one like the 5.3 has but im sure they make adapters. possibly have to get a pcm and harness. but the 5.7 will need some figuring as well. but you start with a base with 50 more hp and the lsx family is way more responsive to mods, where the 5.7 has a flaky fuel system that limits just about anything. unless you spend a ton to put aftermarket stuff from the manifold up.
The mounts will work, but a different bracket will be needed to accommodate the mounting holes so the engine will sit more forward/center. Otherwise the distributor will hit the firewall. Unless I take a 20lb sledge and relocate the firewall, LOL.