1973 Chevy El Camino

Q: I have a 1973 Chevy El Camino with a 350 engine, a TH-350 transmission, and a 10-bolt rear axle with 2.73 gears. All of the parts inside the engine, trans, and axle are stock. The car is a daily driver. I have made some modifications that I hope will not only increase horsepower, but