I've seen as high as 118% in a N/A 4" stroke engine. It makes 549hp from 408CI on pump fuel. When the induction is right, inertia and pressure wave physics take over. Think of the sonic tuned ram manifolds. The technology has gotten much better, and most race engines reach that high at peak torque. I know of a couple iron head Modified Tour 360s that get 112% with the Magnum heads and small cams, and make over 450hp that way. Forced induction goes way beyond 115%. at 7lbs of boost the numbers should go beyond 150%.
