Your gonna have trouble having the fastest car in town.The early mustang frames couldn't handle too much power after the 429 Cobra Jet GT Shelby model was built.That is one of the reasons for the bigger Mach 1.You can add dual exhaust, maybe a slightly lower gear ratio rear end,wheelie Bars, Some Slicks (tires) and try to rid the car of any excess weight.Good Luck and don't kill yourself.Radcing is alot of fun if done in safe conditions like a Professional 1/4 mile track.