Welcome to the club. Well its hard to say what mods since the SC motor is in ur Mustang, and we don't know what mods you have done already. BUT exhaust is always the first place you want to start. Second you might want to add a 5% OD pulley to the SC or you can do the 5% JackShaft pulley. One other suggestion is to post in the 'technical' or 'non-technical' sections. You will get much more exposure out there