Without supporting mods for the polluter you will not be happy, mods like 4.10 gears at the very least,duals,fast intake,injectors,chris1313,killer heads etc, all those mods and more will help a big cam, what i would do is have a custom cam or something,you can get a big cam sound on a much smaller profile and have a better running car,also having a 98 ls1 i would think about upgrading the rod bolts sice with a huge cam your going to be spinning the rpms to the moon,i have a ms4 in my car, its a badass cam but i would have been better off going with a mid 230s cam, but to late for that, well op hope you get what your looking for