Stock mustang gt-215 hp @ 4200 rpm, 285 ft./lb. torque
14.9@93 mph 1/4
0-60-6.1 sec.
I wouldnt expect much better than those numbers w/ your mods, but headers/exhaust will help, go with some underdrive pulleys too. Those things are not too expensive and help a lot. Gears are always a big...