I need 250hp @ 4000ft msl. Turbo or NA?

[Whizbang]

Trying to formulate the engine setup for the rally project. As a general rule, around 250 hp is a good number for a RWD car on a loose surface. Traction is difficult to get as it is. Seems like an easy number but i am stuck in the route i want to go. Its right at that point where a turbo can do it easily and an NA engine can do it with some effort.

Truthfully, i would much prefer a naturally aspired engine. Simple, less heat, simple. etc. BUT the car has to be able to crank out the power at high altitudes. It really seems to be looking like a peripheral port might be the way to go if i decided to take the NA route. But at that point a turbo engine might be easier and cheaper, but certainly more heat is generated and far from "basic" in design.