Chopshop280zx

I have a 1982 280zx with a stock 6.0 ls with a powerglide. The car works great out of the whole but I need to put more power down how can I get this rear end to handle more horse power. If I could get this car to hold about 500 horses out the whole it would be a killer. Some body help me remove these stock axles please. The Z car world has forgotten about the 280zx