Cobra5095

Have a 95 Cobra Convert. and am looking to final put some mods on it. Originally wanted to keep it stock and untouched, but I just cant help myself anymore. Anyways, I want to get around 320hp by the time I'm done. Not real big hp, I know, but its respectable. I'm looking for some suggestions on how to get there without a supercharger or turbo. Only thing done to it now is it has a full flowmaster system on it, and thats how I bought it. Can anyone help me out?