All the above suggestions are great however I would probably keep the stock rearend gears especially if u plan on going with a power adder later on.
Yeah I don't know why I said 4.10s but I always do, it makes your car FEEL way faster but it's just steep gearing.
I'd go 4.10s with nitrous (because it's like no power adder most of the time) and probably keep 3.15 with a supercharger..if that makes sense.
2013 Performance White GT Premium: Tune, CAI, Flowmasters
1970 Mustang 351 Cleveland: MANY mods and improvements
2012 Ford Focus: Rims, Steeda CAI & Tune, Steeda Pro Springs, Steeda Front & Rear Swaybar, Steeda Rear Toe End Link, Magnaflow Catback Exhaust