Be careful - piston engines are subject to losing power with density altitude. If your engine is putting out it's maximum rated horsepower at sea level, on a 'standard day', you can bet the power available will drop pretty dramatically as you climb.
On a hot day, when the density altitude goes up, and your power required goes up, the power available goes down....
SOme of the things you want to discuss are 'full throttle height', maximum obtainable manifold pressure at heights above sea level if there is no turbo or supercharging, and so on.
There is no separate 'power available' chart in the flight manual for piston engines, like there is for turbine engines.
The other