What can I do to make my car faster?

I have a 72 chevelle with a 383 stroker, mild cam, 3.08 gears, beefed up transmission, edelbrock carb, high rise manifold, wide nitto extreme preformance tires (couldn't give you the specs). It just had new vaulve covers put on it. I think they did something to the vaulves also. My dad is in the car business and I wasn't sure what all has been done to it. It's already got a nice flowmaster set up. Probably one of the best cars I have ever heard. No joke. I don't want to do any forced induction but I would like my car to run 13's or 12's. I also want something that when I hit the gas hard my tires screetch and leave tread marks. So like that fast haha. Thanks!