The big question is what have you done to your car so far? Your sig says Mustang GTR, what is GTR?
If you are very close to stock (by your sig you have ported heads, pulleys, Cold air?) you're screwed. You're going to need Good heads, intake, cam, exhaust, gears, etc, to keep up.
Or a Power Adder like a 75 Shot or blower. Even then you'll need a little more than a stock engine and power adder to take a new SS. Those SS's are pretty quick, but if you can get 280-310 HP at the rear wheel's you'll take him. IMO