Hi looking for some major help from anyone who knows how to correctly answer. Question is does anyone know if any 5.3 LS motors that are out of the Chevy Silverados and such or LS motors out of Camaros firebirds corvettes and such will fit under the hood of the GP GXP as a bolt up either to the trans already factory from GM in those cars the Monte ss or impala ss or GP gxp or such or if adapter plates are available to make this happen or not? So to say I've seen alot of posts where the factory LS4 motor already in these cars from GM isn't worth the time or money to mess with build or whatever so if I was to find a different LS motor from GM models trucks or other rear wheel models GM offers or even a crate what would it take to make it work in this car or can it even be done period. Thanks so much for any or all help I can get.