7500 is a lot of rpm. I also have an ls1 car and wouldn't shift that anywhere near that high. You would need some high rpm lifters idk if you can get a solid lifter setup for a 3.8 but that wouldn't collapse. Some intense pushrods. And equally intense valve springs. Roller rockers. And can the bottom end handle spinning that kind of rpm?

But I dont really know a lot about these motors.