My 16yr old nephew has a stock 2 barrel 289 automatic 68 mustang. Him and his dad want to "hop it up". I recommended a carb, cam, manifold and a set of headers. Is there anyone that can recomend a good package or combination for this engine? With these parts will they be able to feel a difference when driving the car? We are not looking for a rocket but somthing with a little more zip. Thanks