300whp or chp?

You can do that with a boosted LS, or any boosted b series for that matter. I think if you have access to good tuning a boosted b16 will own a boosted LS, its stronger and will last longer, just need the good tuning. To retain AC you are going to have to pay a bit more for your turbo manifold, but if thats what you want thats what you gotta do