[Accelo]

You don't need a cam to turbo a engine.
You can easily get 500hp with just the turbo.
The turbo doesn't change the power band.
It just ups the HP throughout the what ever band the motor runs at.

I am skeptical about the costs to install a turbo.
The costs really depends on your skill and fab abilities.
It's the things not mentioned, like pulling the motor apart to gap the rings.
Head gaskets and new bolts are required plus the while I am here stuff.
And installing a oil breather that seems to be left out of the equation.
Cheers