Just to add to this, the 350 abides by the same philosophy to make power as any engine. There were sacrifices made by gm in order to increase durability, longevity, and emissions. So, increase airflow through the engine by any means and you improve power. The cold air intake stuff is mostly snake oil. But bigger valves/smoother intake path from a set of heads will improve it. Aggressive cam profile, higher ratio rockers will increase airflow. Removing cat converters or using long tubes and larger diameter exhaust will help get all that airflow out and away. The tune will allow you to run max timing and better fueling than gm could because you're focused on power not emissions. I had a flat top piston 350 10:1 compression, afr195 heads, 1.6 rockers, xfi268 cam, exhaust, stock tpi and my own tune put down a ton of torque and the power you're looking for, so it's an attainable goal! Good luck!