I think it's all about, torque, traction, and weight. Does your car hesitate when you punch it? A stock car should have most of its torque at the bottom end, up to about 3200 rpm. If you couldn't catch the car, then you don't have enough HP. The stock cam is very poor for performance. A 4B carb and intake is one of the cheapest and easiest upgrades, a good dual exhaust that is not restrictive will help also. Post more info on your car and engine. Good Luck.